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.

Now, what should you eat? There are endless combinations of food and it really depends on your personal preference. I put together a simple 3 day keto menu plan to get you started. This is what works for me, and because my body knows the drill, I can actually get back into ketosis in less than 2 days on this plan. If you are new to low carb, it may take you as long as 4 to 5 days. Don’t despair, it will happen.
Another difference between older and newer studies is that the type of patients treated with the ketogenic diet has changed over time. When first developed and used, the ketogenic diet was not a treatment of last resort; in contrast, the children in modern studies have already tried and failed a number of anticonvulsant drugs, so may be assumed to have more difficult-to-treat epilepsy. Early and modern studies also differ because the treatment protocol has changed. In older protocols, the diet was initiated with a prolonged fast, designed to lose 5–10% body weight, and heavily restricted the calorie intake. Concerns over child health and growth led to a relaxation of the diet's restrictions.[18] Fluid restriction was once a feature of the diet, but this led to increased risk of constipation and kidney stones, and is no longer considered beneficial.[3]
I’ve only one question. I work in shifts and at 4.30 in the morning I can not eat my breakfast (lazy – I manage to get out of bed and into my car in 30 minutes ;-). Not even if I make it the day before…I just can’t swallow the stuff. But I have to eat something because I’m in my car for more than a hour. Can I have a liquid breakfast at those times?
8. All brands are not created equal. Sometimes (but not always) you have to pony up for the name brand over the generic because the carbs are less – this is generally true with cream cheese for example. When buying heavy cream, go organic if you can find it because some brands use thickeners that add carbs. Buy your cheese in blocks or slices rather than in shreds – the shredded cheese is coated with food starch to avoid clumping and that adds carbs.
As a note, you do need to check the carbohydrate content of everything you eat, especially processed foods such as sausages, cheeses and sauces. There could be hidden carbs in the products used to preserve or “pad out” these foods, so make sure you are buying the lowest carb options and counting the carbs they do contain to ensure you don’t go over your daily limit.
Sleep enough – for most people at least seven hours per night on average – and keep stress under control. Sleep deprivation and stress hormones raise blood sugar levels, slowing ketosis and weight loss a bit. Plus they might make it harder to stick to a keto diet, and resist temptations. So while handling sleep and stress will not get you into ketosis on it’s own, it’s still worth thinking about.
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