Fasting is good advice ...
Well, I’m 55, 5’7”, 135lbs, and have been that way pretty much my whole life.
Still wear 31” Levis.
I love food and love to eat but generally eat pretty light... unless I’m good and hungry, I mean ravenous, which is when I go into chef mode and spend a couple hours making spaghetti or a huge vat of chicken soup or stir fry or something.
I can tell when I need more minerals because I will get small muscle aches, so I up my calcium and magnesium. General lethargy, I up my vit B12 and C.
Wish there was a way I could tell the difference between being hungry (simple low blood sugar) and needing to up my protein. (I could probably do it with some type of urine test but I don’t need a full bore clinical chem lab in my house...)