If you trade the simple carbs (white sugar, flour,
rice, pasta, etc)
for complex carbs, you will accomplish the same thing. Complex carbs (fiber - fruits, veggies, whole grains, etc) help make you feel fuller faster and keep you feeling fuller longer, as does protein.
With the proper food, there should be no depression due to lack of tryptophan or anything else.
Your body needs all of the different food groups, including carbs, so best not to try to eliminate any of them.