Depends on what you are snacking on and what your meals are normally like.
For *most* people their full meals are very calorie dense, heavy foods.
If you can satiate yourself with low calorie, quality sources from planned snacks (yogurt, cottage cheese, oatmeal, veggies, ect) then you may actually be able to reduce the amount of food you eat at dinner time due to feeling less hungry.
A well planned snack can actually help you lose weight that way since you aren't going into binge mode at dinner time on higher calorie foods.