The serving size is not as important as its contents. A milkshake and a Burger, a few jelly beans or small candy bar have the same caloric content as a few tasty, healthy and nutritious meals.
But even healthy food can carry the risk for losing weight. For more than salad for Breakfast you get hungry, a handful of nuts can be much high-calorie whole meals and dried fruits are easy to overeat.
This and many other things tell food bloggers Amanda Meixner (Amanda Meixner), Mullin Ilana (Ilana Muhlstein), Rachel Paul (Rachel Paul) and Ryan Carter (Ryan Carter). They for example argue that the correct food is tasty, reasonable and not at all boring.