There will be times when you'll eat less...times when you'll eat more.
The goal isn't to 'eat until you're full'. That's typically overeating. Eat until you're just 'not hungry'.
The rest will work it out assuming you're not zinc deficient. A good multi is a good idea.
For men, I like Rainbow Light Men's Just Once
For women, I like Rainbow Light Women's Just Once (if eating red meat daily and if there is NO issue with anemia ever) or Natrol My Favorite Multiple Take One Original if eating red meat just a few times a week OR if anemia has ever been an issue.