Some people achieve this via low carb diets and keto, but intermittent fasting is also a good way to do it.

I've been on the one meal per day thing for years.

I'm approaching 50 and have a physique comparable or better than most 20 year olds.

So while it's a data point of one, I can say that it works very well for me and I enthusiastically recommend it for multiple reasons, not just bodybuilding.

I regularly experienced headache and mild hypoglycemia a few hours later, but it took me a very long time to connect the dots.

I also used to drink an unhealthy amount of sugar in various form, cola or so-called energy drink. Those are very effective to give a temporary boost.

At some point I tried something different, no breakfast, no soda and either a single large meal in the evening or a small meal mid-day and a medium one in the evening.

In my case there is absolutely no doubt this is much better, no more headache or sugar crash, I've seen changes in my body, mood, mental clarity and overall energy.

Digestion is a complex process, eating sugar can be extremely efficient as a booster as it can be used almost instantly, but it is very easy to eat too much and trigger the storage mechanism that has the exact inverse effect.