Liliann, I think a lot of us throw in the towel in the afternoons.

We're tired and it's easy to give in to food. That time of day has always been bad for me.
If it's any help, I'll show you what my dietitian has me doing. The number of calories allowed is tailored to my own weight-loss needs, of course. You may need more or less, but this'll give you a general idea.
Something she stressed is that we absolutely need those snacks! Eat before you get hungry... our bodies need fuel throughout the day, not just when we feel hungry.
Breakfast (400 cal)
2 starch
1 fruit
1 dairy
1 protein
1 fat
Snack (100 cal)
1 dairy
Lunch (400-500 cal)
2 starch
veggies (a bunch)
1/2 dairy
2 protein
1 fat
Snack 2 (100-200 cal)
1 fruit
1 protein
Dinner (400-500 cal)
2 starch
veggies (lots)
1/2 dairy
3 protein
2 fat
Snack 3 (100-200 cal)
1 starch
1 protein