Okay, I am unsure what is best to do here (and I am sure it may just depend on our own bodies), but I am curious to see what others do. (I actually have a few questions

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1. I have been eating good fats, good carbs, protein etc. and fitting it into my 3 meals at appx 400 each, and 2 snacks at appx 200 each for my dialy calorie intake of 1600. Since I am eating more fiber, protein, etc. I am finding myself less hungry during the day, and not eating one of my snacks.
~ Does anyone else experience this fuller feeling with your food changes that makes you not want to eat a snack? If so, are you still eating your snack to get in your calories? (Which leads me to the next question).
2. When I skip a snack due to a filling breakfast or lunch, that opens up some calories that I can use somewhere else. Normally, I assign these calories to dinner. So my 400 calorie dinner, can now have 600 calories.
~ Should I still stick with my 400 calorie meal, and just not use the 200 calories? Or should I increase the protein or vegetable I am eating to consume those extra calories?
3. Does all this mean I should maybe lower my daily calorie intake?
Sorry, for all the questions, I am just trying to figure out if the fuller feeling more is due to the fact that the foods I am eating are satisfying enough to lower my calories.
I work out between an hour and half to two hours five - six days a week.
Thanks in advance for your opinions!