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7 Days on the Ketogenic Diet

ketosis, ketones, ketogenic diet, dietitian on a ketogenic diet

The ketogenic diet is essentially the Atkins diet of the 2010s. Super popular, almost impossible to maintain long-term, and wildly effective for weight loss (per anecdotal reports as well as scientific research).

What is the ketogenic diet? Your goal on a “keto” diet is to get at least 70% of calories from fat, no more than 25% of calories from protein and only 5-10% from carbohydrate. For most people, that means restricting your carb intake to below 50 grams a day. The diet first started as a treatment to decrease seizures in children with uncontrolled epilepsy. The body and brain is forced to get energy from fat instead of carbs, which produces ketones in our body that then fuel our cells. Reports as far back as the 1920’s show that when epileptic children switched to a strict all-fat diet, their brain adapted its fuel source and less seizures occurred.

If the brain of someone with epilepsy could benefit from running off of ketones, could your average Joe also get some kind of benefit? Researchers had this same question and since the 1960’s there has been evidence that a ketogenic diet is effective for weight loss and improving insulin resistance. Emerging data also suggests a neurological advantage as well as an anti-cancer effect. Please note, I’m saying evidence exists. That doesn’t mean the verdict is in and that doesn’t mean that the ketogenic diet won’t have negative effects elsewhere.

What do you eat? It’s easier to start with what you DON’T eat. No bread, fruit, starchy vegetables (like potatoes or corn), cookies, candy, ice cream, pizza, sandwiches, rice, quinoa, cereal, oatmeal, waffles, smoothies, beer, protein bars… basically, most food is off limits.

That leaves us with full fat dairy (cheese, plain yogurt, butter), greens like spinach and kale, nuts and seeds, nut butters, oils, coconut, cacao, avocado and small portions of fatty fish, beef, and eggs.

Some people hear this and think YES! I can eat all of the bacon and butter I want to. Not me. My favorite things are fruits and grains and I don’t eat much meat. Oh yeah, and I’m lactose intolerant.

So why would I try this? I was completely dismissive of the ketogenic diet at first. Putting butter in coffee is going to help my clients lose weight? After I’ve been telling them how important it is to have a balance of protein, fat and carbs at regular intervals? My way works– why would I want anyone to try this extreme diet?

After a few years, I finally gave in to listening to a few lectures from Dr. Jeff Volek, a dietitian and researcher at Ohio State, the expert of experts on ketogenic diets. Despite the sense he was making, I quickly dismissed everything he was saying. I can’t eat that way for a prolonged period of time and neither can my clients, so what’s the point?

Then, I heard a podcast from Tim Ferriss with Dom D’agostino, another popular keto researcher. I did a little more research on my own and continued to hear and read about high level athletes utilizing the ketogenic diet and performing at the top of their game. People who are keto-adapted swear they have a mental clarity they never had while eating carbs, energy levels through the roof and increased concentration. Maybe it was doable after all…

My experience: I woke up one morning and told myself that today was the day. Just make it through one day without carbs and see what happens. Without much prep time in the way of grocery shopping or meal planning, I had no idea what to eat for breakfast. My usual sprouted grain toast with almond butter and mango was out the window. I threw together some “fat-balls” with stuff I had in the pantry: almond flour, natural peanut butter (only ingredient: peanuts), melted coconut oil, shaved unsweetened coconut, and chia seeds. Think balls of cookie dough with no sweetness. I got through a strength-training workout just fine on a few of those. I had about 3 hard boiled eggs throughout the day then a large salad with greens drenched in olive oil and avocado, a piece of mahi mahi and some olives for dinner. The tough parts of day 1 were saying no when we stopped at Jeremiah’s Italian Ice on the way home from the beach and wanting to eat an apple after dinner. Other than that, no big deal.

The weirdest thing happened when I woke up on Day 2. I had abs. Abs like I’ve never seen on myself. It was like the layer of fat that had been hiding the muscle had been stripped away overnight. Being a dietitian, I know how ridiculous this sounds. I couldn’t help thinking of all of the years I’d been busting my ass in the gym to just turn around and see abs from not eating carbs for one day. Now, it wasn’t magic… there’s a scientific reason why I all of a sudden looked toned. The body retains water when you eat carbs, which isn’t necessarily a bad thing. Glycogen is the storage from of glucose, what your body uses as fuel when you eat carbohydrate. Every gram of glycogen in your body is bound to 3-4  grams of water. Since I didn’t give my body any carbohydrate for energy the day before, I burned through my glycogen stores and the water attached to them as well. I did not actually get rid of any fat on my body. If I were to eat a high carb meal, the water weight would quickly return.

Day 2 was really rough. My brain was not working. I left my phone in the refrigerator. I had a hard time coming up with the right words I wanted to say. I worked out late and was unable to maintain my previous week’s PRs. Despite not eating any carbohydrate-rich foods, my intake still ended at over 50 grams from “incidental” carbs from foods like edamame, chia seeds and milk.


Day 3 was a completely different ball game– a world of difference from the day before. I was in a great mood and felt high in energy even at 8pm (I’m usually over everything by 7pm). I ate a meal at around 7am then not again until 2:30pm. I would normally never go that long without eating without having a major freakout. But, I never got hangry. I had great workout and especially felt good after 3 scoops of my go-to BCAAs (read more about BCAAs here). I felt like I was over the hump! I looked fitter than ever and I could visibly see more definition and muscle tone. If I felt like this all the time, maybe I really “do keto.”

Day 4 Nope, I can’t do this. I couldn’t even get out of bed in the morning. I felt hungover. I was not hungry at all and I had no desire to eat. I finally did eat at about 9am (about 4 hours after I got up- not like me at all). I was craving fruit, but made an omelet with avocado and cheese. I ate half of it and didn’t want the rest. I was really sick of the repetitive foods, the soft textures and all of the oil. I felt like my body was starting to reject what I was giving it. All I wanted to do was sleep, I had no motivation, was absent-minded and my muscles were overly sore. I did a urinalysis and tested positive for ketones.


Day 5 Bullet-proof coffee to the rescue? I made a cup of french-press and blended it with grass-fed butter. I guess it worked. I felt fine and ended up fasting for 15 hours. I now understand why intermittent fasting and the ketogenic diet go so well together: you’re not hungry and there’s really nothing you want to eat. My go to was full fat greek yogurt with almond butter stirred in and unsweetened cacao. I started getting muscle twitches in my right shoulder and back. Have you ever had an uncontrollable, never-ending eye twitch? It was like that.

Day 6 Restless sleep. Moody. Really struggling. There is nothing that I want to eat that doesn’t turn my stomach to think about. I had no energy to work out and I was still sore from a day 4 workout, which was in no way normal. It was my boyfriends birthday. I picked up his favorite dessert– a key lime cheesecake, which I, of course, couldn’t have. I took him to dinner at a place I knew he had been wanting to try. It was the type of place that changes their menu daily and doesn’t appreciate people asking for substitutions. There wasn’t an entree on the menu that I could have that didn’t make me feel sick to think about so we ended up sharing a charcuterie and cheese board. I hated it. He hated it. I wanted no part of meat or cheese or nuts any more. Food is a big part of our relationship– we love trying new foods, new places, and cooking for each other. All of that would have to go if this was going to be something I continued. He asked if we could not go out to eat again unless I knew for sure there was something that I could eat on the menu that I actually wanted. All I wanted was a damn mango.

Day 7 My ketone strip showed a trace amount. So frustrating! I ruined a birthday dinner for nothing. One glass of wine knocked me out of ketosis. I decided to fast until the afternoon until I was testing higher. It’s not like I wanted to eat anyway. That’s the weirdest part of this experience– feeling no hunger, no desire to eat. I guess it’s convenient because you spend less time preparing food or going to get food. I was in a horrible mood and it was effecting my interactions with clients. I had a fun weekend planned: tickets to 2 different shows and a beach trip. I started to re-evaluate. I felt like crap, my body was sore and tired, I was less active and my work and relationship were both suffering. My brain was sluggish. I couldn’t imagine getting though the weekend in the mood I was in. I was really feeling some of the negative effects of starting a ketogenic diet, which can widely differ from person to person (Here’s a post that covers the whole topic of common side effects).

I reached out to some hardcore keto-ers:

“You’re just experiencing keto-flu. Up your sodium intake with some broth and it’ll pass in a few days.”

“The first week isn’t pretty, especially in the gym. It has a big impact on energy levels once you get going though. Worth it!”

“Stick with it. It takes the body weeks to adapt.”

Despite their encouragement, I gave up. I gave up hard. A mango, a slice of the cheesecake I missed out on earlier in the week, a glass of wine, a beer, and nachos. My mood immediately improved. Eating foods with texture and crunch again was like a gift from heaven. I enjoyed my weekend then headed to the 3-day Today’s Dietitian Symposium. They provided breakfast and lunch for the conference and I realized that if I was still doing keto, there was literally nothing I could eat that they offered. Breakfast was flavored yogurt with bagels, fruit and muffins (great choices for a conference for dietitians, right?). I guess I could eat the cream cheese with a spoon? Lunch was a wrap stuffed with couscous, a side of pasta salad, an apple and a bar. There was a small market in the hotel with bananas and pastries, but nothing I could have eaten there either. The expo room did have some walnuts. I definitely felt “fluffy” from all the carbs and have gone back to being hungry every few hours.

From my experience, the ketogenic diet is not something you can realistically stick with if you enjoy food. If you like traveling and trying new things, going to restaurants, celebrating a friends birthday with cake, those things kind of have to go out the window. You have to plan every meal ahead and take food with you everywhere. You can’t rely on grabbing a quick bar or a banana. Like every other diet out there, you can do it for a few days or weeks then you fall off the wagon when you realize you can’t do it forever. If food isn’t a priority for you or you have a propensity towards higher fat foods, you could make the ketogenic diet work. It may be worth it, but for me right now… I just couldn’t do it. I am bummed that I wasn’t able to make it a few weeks and see if there was a difference in energy levels and focus but on that last day when I tried to force myself to eat my salad drenched in oil, cheese, and beef, I literally had to spit it out. That was the last straw for me. Keto was making me a crazy person.

Would I try it again? Maybe… with exogenous ketones (apparently they help you to get over the “keto-flu”). But then I think: “never have fruit again? Never have cheesecake again?” Never mind. I’ll go back to my healthy, balanced diet. It’s got me this far.

UDPATE (7/25/16): I did try again. I thought maybe with a little experience under my belt and some MCT oil powder, I could conquer keto for more than a week. The big push was that my boyfriend wanted to see how keto affected him as well. Since he is a lot more inclined to eat fatty foods, he thought it would be pretty easy and agreed to help with cooking. Well, we made it 10 days. I got my LDL cholesterol tested (which has never been high) and it was 218. Now I know there is debate on what this LDL result really means when you’re following keto and if your risk for heart disease is greater, but that was just another sign that my body did not like what I was doing to it. I was tired, unable to work out like I do normally, and each day crawled by. One day felt like four days. I tried sticking to a 2:1:1 fat:carb:protein ratio, but my body clearly did not love eating mostly fat and was not inclined to stay in ketosis. I went to a BBQ and the only thing I could eat was a hot dog with mustard and no bun. Gross. How in the world can this be good for me?

After eating a thai chicken salad (no carbs on it) with minimal dressing and some blueberries, I saw trace ketones on my urine stick. I tried to minimize the damage with MCT oil powder and coffee. Still trace. After that, I was done. If I can’t even eat a few blueberries, my body feels weak and tired, and I’m not even seeing the leanness that I saw the first time, there’s no point in me continuing. My boyfriend couldn’t wait to go back to our more balanced way of eating either– no more oily salad please! Even the biggest proponents for the ketogenic diet agree that this is not a one-size-fits-all solution for everyone. Each person is an individual and what works for one will not work for all. One thing that I will continue to do is to make sure I’m getting a good source of healthy fats every time I eat from foods like avocado, nuts, seeds, pasture-raised eggs, and extra virgin olive oil. But, I’m pairing them with a complex carb. My ezekiel toast with avocado and eggs are staying on the menu.

If you need help losing weight, improving your performance or increasing your energy, contact me at megan@orlandodietitian.com or schedule your appointment here. Not in Orlando but still need some nutrition tips? We also do online or over the phone consultations.


Beyond weight loss: a review of the therapeutic uses of very-low-carbohydrate (ketogenic) dietsEuropean Journal of Clinical Nutrition (2013) 67, 789–796; doi:10.1038/ejcn.2013.116; published online 26 June 2013

Ketogenic Diet for Obesity: Friend or Foe? Int J Environ Res Public Health. 2014 Feb; 11(2): 2092–2107.

Ketogenic Diet Resource

Long-term effects of a ketogenic diet in obese patients. Exp Clin Cardiol. 2004 Fall; 9(3): 200–205.

26 responses to “7 Days on the Ketogenic Diet”

  1. LOL! This was like reading a transcript of my own experiment with a super low carb elimination diet. I, too, only lasted 1 miserable week, and quit HARD ;) I appreciate the honesty and humor.

    I am also a dietitian, and it was a great learning experience for what my clients might go through! Now I just stick with my trusty MRT testing & LEAP diet for suspected food sensitivities instead of doing such an extreme elimination diet. Live and LEARN! <3

  2. MeganWareRD says:

    One thing I realized is that if it doesn’t feel right to you and your body, you definitely shouldn’t be doing it. I’m more inclined towards a veggie and fruit heavy diet. I don’t crave or feel good about eating fatty meats so going ketogenic felt like I was going against my body. That seems to be the core issue with most diets, a battle of you vs. your diet instead of working with your body with what feels right for you.

  3. umair usman says:

    wonderuflly put

  4. Mark Lowe says:

    At least you tried it which is more than can be said of most people who dismiss a ketogenic diet just “because”. I am thriving on a ketogenic diet. Lots of energy, mood is improved. And I actually like the meals I prepare. I was a “carb addict”. And not healthy carbs either. So I am 3 months in and NOT changing. It is working for me. Plus I am down 25 pounds in those 3 months.

  5. Marisol Tellez says:

    I’ve been easing my way into it. Trying out recipes here and there and seeing how far I can go. I definitely went through the Keto Flu and it was horrible. Nothing a good plate of mac n cheese couldn’t cure. I haven’t completely got it down but for right now I think figuring out what recipes I like and how to maintain some variety is key.

    • carlos camargo says:

      A good plate of mac and cheese definitely took you out of ketosis. It’s probably not the best exit ramp ;-).

  6. […] I like to do experiments on myself. When I notice a lot of clients asking about a certain diet, way of eating, supplement, or product, I make an effort to try it myself instead of just quickly dismissing it as a fad or gimmick. (Check out 7 Days on the Ketogenic Diet). […]

  7. […] I think this whole vegan thing is actually getting easier the longer I do it. Back when I did the keto experiment I felt like every day was torture and I couldn’t wait for it to end. Right now […]

  8. VickieV says:

    What do you do if you don’t like vegetables just salad? That is my problem!

  9. deborah says:

    If you really want to do keto and change your body, get rid of inflammation, etc., even diabetes (Type 2), lose weight if you like, and be able to stick with it (and stick with it with ease: it will change your life), go over to https://www.dietdoctor.com and do the two week challenge. THEN you will understand the revolution. :)

  10. deborah says:

    Note that Sweden has done the science and has the proof and has adopted LCHF as a healthy diet. https://drmalcolmkendrick.org/2013/10/20/sweden-gets-is-right/

  11. Hala Zabaneh says:

    Ten days is nothing…You have to finish 3 week for the sugar cravings to pass by and please for the love of god get a cook book. I found not eating carbs helped me get rid of my irritable bowel Syndrome and my performance at work increased and my mood is WAY better, I am a much happier person. BUT there is a limit you start with the extreme, and then after 3 weeks you introduce a few carbs. I never used the ratio, and I was able to burn and now maintain 145 for the last 3 months. I started in Juanuary of 2017 and went down from 165 to 145lbs. It is life changing. Clarity like no other. And please, treat yourself every now and then…eat a cheesecake…or have a glass of wine every now and then. NO ONE IS PERFECT.

    • Hi Hala,
      Thanks for your comment. My philosophy is that everyone should listen to their body. What works for one person is not going to work for everyone. My body did not like keto and responds much better to a plant-based diet. That doesn’t mean that you won’t feel amazing and be totally satisfied on a ketogenic diet. I am glad that you found what works for you. Genetics plays a huge role in nutrition. Even Jeff Volek (one of the top researchers and proponents of keto), who I met at a nutrition conference, agreed that it is not for everyone and that each body will not respond in the same way.

      • Hala Zabaneh says:

        That’s fair. :) Hope you find something that works for you!

      • carlos camargo says:

        Hala’s comment stands and you probably know it as well. Unless you have become keto-adapted, you haven’t really gone keto. Congrats for dipping your toe, I think for your next attempt you should go for at least 12 weeks, to give your body some time to really become adapted and get past the early stutters. As you know, urine ketone strips only register ketones that you’re peeing out, once you become adapted, they no longer show ketones. Of course I’m not going to argue with Volek but at the same time, he probably didn’t want to argue with you either :-). Try it for a longer term, to see the real benefits. Or don’t but I don’t think that a 7 or 10 day toe-dip really qualifies you to give a true review of the diet. Similar to how a short-term vegan diet probably won’t hurt my body too much but over a longer term I’d suffer significant deficiencies, one can’t use short-term trials on what is really a long adaptive process.

  12. […] are a versatile and healthy component of any breakfast, and can easily be worked into a keto diet – whisk up three eggs and start cooking in a hot frying pan, while you chop 2oz salmon and […]

  13. Sachi Master says:

    I would like to know after the 7 day keto diet, what was the 8th day diet you followed going to back to normal routine? I know we are bound to put on weight but what do you exactly eat after keto?

    • Sachi I just went back to my normal day-to-day diet. Mostly vegetarian, high in plant-based foods. I didn’t go crazy on the carbs just worked back in things like blueberries, mangoes, and ezekiel bread.

  14. Lj Thomas says:

    You just told my story. :-) I have found I can only stick to a keto diet-any diet for that matter-if I can at least have my one slice of Ezekiel toast with almond butter in the morning, even if it’s only 3 times a week. A slice is only 15 TOTAL carbs anyway. So I alternate each day. One morning I’ll have the toast, the next morning I’ll have half a small grapefruit. If a diet is not palatable and sustainable-it’s useless.

    By the way, cheesecake can easily be ketogenic, as long as you use a sugar substitute like Stevia or Xylitol. I sometimes also make a crust with almond meal and melted Kerry Gold butter and bake it about 10 minutes prior to adding the filling. (Just 3 eggs, 16 oz. sour cream, two 8 oz. packages sour cream, 2 T. vanilla extract and 8 packets of Stevia or the equivalent of your preferred sweetener. I make a 9″ cheesecake and have 1/8 of it for breakfast each day. YUMMY! I don’t even need the Ezekiel bread on those days!

  15. Nicole Zalewski says:

    You made a number of mistakes, the biggest I can see is not supplementing electrolytes. Those muscle shakes were a big signal you need magnesium. You are also using the Keto strips incorrectly. They don’t determine whether you are in or bumped out. Any change in hue means you are in. Dark purple is actually not a good sign it means you are either not hydrated enough or you are in “starvation Keto.” it also sound like you weren’t getting enough calories at all and you really didn’t vary your diet and include enough fiber. You definitely should study the diet more and give it another go. You made SO many glaring mistakes that I learned not to do just by reading and researching. You were starving yourself no wonder it didn’t work. Plus since you seem to have a lot of sugar in you diet, it may actually take you a couple of low energy weeks to adjust. But what this article describes is actually a lot of common mistakes which make people give up. You could have easily relived a lot of your symptoms by drinking tons of mineral water, honestly.

  16. Nicole Zalewski says:

    Aldo eating a hot dog? Powdered suppliments? Sugar alcohols? Not what is going to work. Whole foods. Grass fed beef. Do it right not with products made in a factory. You’ll feel better.

  17. Linda Kaye Walker Pinkston says:

    This is kind of funny to me. I’ve been following this a month and have had absolutely none of these “symptoms”. I have lost 22 pounds, though, and feel amazing! :)

  18. Matthew Michael says:

    It’s unfortunate you didn’t give keto more time and more study. I’m a chef by trade, and i can tell you there are endless dishes without carbs that are amazingly delicious. My life has been transformed due to keto. It’s not a diet, at least not for me, a diet usually implies an end date. This is it for me. Give yourself the opportunity, at least a month, and what you’ll gain will be priceless: adding vibrant years to your extended life expectancy.

  19. Bellamas says:

    The diet is unsustainable, expensive and I simply do not believe most people stick to it. They say you can eat unlimited non-starchy vegetables. You can’t. To keep carbs under 20 grams is absolutely ridiculous. You will feel sick. You will feel run down. Without expensive supplementation you can die. What is good about this diet? After anti-epileptic medication came on board almost everyone on this horrible diet stopped. Even Atkins only had his patients do this for a few weeks. Then they went back to more normal ways of eating. The Ketogenic Diet has become like Crossfit. It is more of a religion. A religion that makes you physically ill.

  20. Daniel Smith says:

    So, keto isn’t for people who like food because you didn’t study enough about it and didn’t follow it correctly and didn’t have the will power to stick with it because food has that much control over you?

    The first week eat as much fat and protein as you want. You’ll slowly start to eat less. Also, sugar free Powerade, drink those and water, and salt everything.

    It’s easy for me and I’m a huge carb junkie, but I did it correctly. As a dietitian I have to question your lack of research. Also how high were your fats? I see lots of people not eating enough protein out of fear. I eat 300-350 grams of protein a day and am losing fat daily.

  21. Marissa says:

    Great post! Totally laughed that you left your phone in the refrigerator! lol. I love that you’re an RD that goes out and tries these diets for yourself so you can better relate to your patients and speak to them from personal experience along with your scientific knowledge. I also truly appreciate your non-biased approach to these fad diets. You clearly see both perspectives and review the pros and cons to each diet. Although this may work for some, it is a very tough diet to live on.

  22. […] trends in the nutrition world. Instead of immediately dismissing a client when they ask about the ketogenic diet or intermittent fasting, I am not only able to speak to my clients from a professional perspective […]

  23. Ketogenic diet is a serious diet that should be done by people who’s really up to do some serious diet.

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