I think most people who try keto understand this. I do ok on keto, but better on low-med carb, typically fruit and oats or potato. Plenty of meat, especially red meat. Too much refined carbs or wheat(most grains bar eirkhorn and oats) and I feel sluggish despite being fairly fit.
Milk, meat and some potatoes and I'm at my best. I'm sure genetics plays a part.
Starting keto is a real eye-opener. A fog you didn't even know was there lifts from your mind. It's difficult to explain until you experience it. Your muscles will be weak for a few days, and that's normal. Your body has grown accustomed to cheap and easy carbohydrates as a fuel source. As you force it to convert to burning fat for energy there is a transition where the muscles are short on energy.
It doesn't work just tot eliminate carbohydrates. You have to have enough fat. If you eat all lean meat (chicken, turkey, etc.) your body will use the protein as an energy source and that's not as potent as using fat for energy.
Keto is great but many go to extremes. While carbs are bad in the case of sapping energy and causing various kinds of inflammation, it's not that bad to have carbs once a day or so, but making them a staple of every meal will clearly be a burden. Most people don't know how to counteract insulin spikes, fix a leaky gut or contend with a hormonal imbalance. Once you get the hang of these things and a deeper understanding of the fixes for these problems, the state of popular nutritional advice becomes grossly clear - modern nutritionists are generally pretty incompetent and the ones that prove as exceptions usually aren't that highly regarded. Just like Hoppes9 mentions, you need fats. Another thing people usually miss in their diets is salt, again, namely due to the retardation that is modern nutrition, which suggests cholesterol is bad when, in reality, you cannot have too much of it.
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