2. Frozen Meals

To make fresh ingredients last extra long in your freezer, food manufacturers often load frozen meals with sodium, a natural preservative, Harvest says. Sodium makes you retain water, which bloats you up – so you won't look and feel your best regardless of how much weight you want to lose.Also: When food manufacturers try to squeeze a meal's worth of calories into a teeny tiny box, every bite ends up containing lots of calories by design, Harvest adds. While large portions trick your brain into thinking your body is full, the measly portions found in freezer meals are inherently unsatisfying, even though they contain plenty of calories. So skip them if you can, and supersize your portions of lower-calorie foods.