sparing in one's use of something (particularly food and drink); using very little of something
It's a proven fact that people of abstemious habits remain healthy for longer than others.
ab abs (from)#temetum (strong drink) (Latin)
abs (abs) + stemious (stamina): To build stamina or six pack abs, you have to eat and drink carefully. focus on 'abs' part of this word. Abs. To build a six-pack abs, eat n drink carefully ABstain from eating STEM take abstemious as abs + tummy + ous that means ABStain from eating to have a flat tummy (stomach).