Everything stated in the above posts should be based on what your goals are and how much you know about your body chemistry.
I’m a bodybuilder and whether I eat one meal a day or 6-8, I have to use supplements in order to obtain everything my body needs to develope more muscle and be healthy while I’m doing it. I prepare at least one gallon of water a day which contains all the extra nutrients (including protein and BCAA’s) that I will need to complete a full training period which is about an hour and a half of lifting followed by about 6 hours for my body chemistry to do its job prior to my sleep period.
I lift heavy 3 days a week and lighter with more reps the other 3 with no harm done other than the much wanted micro-fissures in the muscle fibers.
So yes, a person can lift heavy but it all depends on how serious a person is about muscle strength and gains.
Muscle has to be somewhat stressed to grow stronger. If the heaviest thing a person lifts on a daily basis is 10-20 lbs and then goes to the gym and lifts the same weight with more reps, chances are that person isn’t building strength even though things might tone up a bit.
There are all sorts of athletes who are either on an intermittent fasting gig or on the OMAD diet who do quite well but then, we also know what we’re doing and not simply going about our diets in a willie-nilly fashion but as a part of our training. Our diets aren’t just part of what we do, it’s the very foundation of what we do.
Whether studying parcour, training for long distance running or bodybuilding as I do, if a person gets dizzy or is light headed or nauseated, there’s a good bet that that person isn’t on a good track with their diet needs.