Keto diet and intermittent diet
The answer is secondary prevention. It deals with the hidden diseases and tries to prevent an asymptomatic disease from turning into a symptomatic disease. These measures or preventions allow early detection and quick effective treatment to a disease. These consist of "early diagnosis and prompt treatment" to contain the disease and prevent the spread to other individuals. It also prevents future complications and disabilities from the illness.
The more, the better, but do not over do anything. at least 2 i'd say. i mean i live in a healthy family where every meal we have, there must be 2-3plates of veggies. so yeah.. i enjoy it tho.