Generally speaking, “A low-calorie meal can be in the 300 to 400 calorie range for breakfast and 500 to 600 calorie range for lunch and dinner meals, and 100 to 200 calorie range for snacks,” says Vandana Sheth, R.D.N., C.D.E.S., F.A.N.D. That said, while keeping a general calorie goal in mind may be helpful, especially if you’re following a low-calorie diet , it’s essential to remember that every body has different needs and one calorie goal simply won’t work for everyone, says Lindsey Palmer, M.B.A., M.S., R.D.N., vice president of nutrition and industry relations for Chartwells K12 .