A small Feb. 20, 2017, study looked at the impact of a six-week ketogenic diet on physical fitness and body composition in 42 healthy adults. The study, published in the journal Nutrition & Metabolism, found a mildly negative impact on physical performance in terms of endurance capacity, peak power and faster exhaustion. Overall, researchers concluded, “Our findings lead us to assume that a [ketogenic diet] does not impact physical fitness in a clinically relevant manner that would impair activities of daily living and aerobic training.” The “significant” weight loss of about 4.4 pounds, on average, did not affect muscle mass or function.
Other down sides: There’s an initial period where your body is adjusting to its new carb-free existence, and many people experience symptoms like fatigue, brain fog and nausea for a few weeks. You also end up deficient in important micronutrients, like folate, calcium and potassium, which is why most ketogenic devotees recommend taking multivitamins. Personally, I recommend my clients follow a diet that in its ideal state provides all of the nutrients you need through real, whole foods.

Bonnie J. Brehm, Randy J. Seeley, Stephen R. Daniels, and David A. D’Alessio, “A Randomized Trial Comparing a Very Low Carbohydrate Diet and a Calorie-Restricted Low Fat Diet on Body Weight and Cardiovascular Risk Factors in Healthy Women,” The Journal of Clinical Endocrinology & Metabolism: Vol 88, No 4; January 14, 2009. http://press.endocrine.org/doi/full/10.1210/jc.2002-021480.
I am confused by this statement, as there are many wonderful “white” substitutions that taste great, and don’t make me feel like i am missing out. One of the things I thought I was just going to die if I couldn’t ever have it again, was waffles with peanut butter & maple syrup. Guess what….there is a sub for that! I am T2D, and my doctor, who specializes in diabetes, told me to stop eating sugar, carbs and she said that in a perfect world, I would stop eating fruit, as it contains sugar. That’s when I found Keto, on my own. I’ve been on it for a little over a month or so, and have lost 12lbs, but more importantly, BS levels that were averaging in the 200’s are now lower than the 90’s, consistently… The highest number I’ve tested was 97, after I ate dinner & had a satisfying bowl of Keto ice cream. I’ve been diagnosed Diabetic for approx 4yrs, but am certain I was diabetic for probably 3 yrs prior to that. I’m not over weight, and did not have the hope of “losing weight and getting off meds”. This has been my answer, and I truly think that if we did live in a perfect world, more things like this would be taught to those of us who need better choices than medications. There are so many other things in the world that are suppressed due to greed of Big Pharma & Government. Let’s start helping our fellow man be healthy & heal….
Your body needs a certain amount of essential vitamins and minerals to function properly. What happens when you don’t get enough of them? What happens when you eat too little food, or when the food you eat isn’t sufficiently nutritious? Perhaps our bodies catch on and reply by increasing hunger levels. After all – if we eat more, we increase the chances of consuming enough of whatever nutrient we are lacking.
Con: Results can vary depending on how much fluid you drink. By drinking more water, you dilute the concentration of ketones in the urine and thus a lower level of ketones will be detected on the strips. The strips don’t show a precise ketone level. Finally, and most importantly, as you become increasingly keto-adapted and your body reabsorbs ketones from the urine, urine strips may become unreliable, even if you’re in ketosis.
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