Food Habits

I don't know about anyone else, but when I decide I like something (foodwise) I eat it for a while. I will eat that thing everyday for a month, two months, maybe even a year. Then all of a sudden, I've eaten too much of that food and sooner or later I get to the point where I can't even look at that food without feeling sick to my stomach. I will feel this way for months and then after a while that feeling will start to go away and the food will look enticing to me again. Why does this happen? Weirdness.....

some examples are:
popcorn
cottage cheese
peanut butter sandwiches
poptarts
different types of cereal
oatmeal
cheese
bagels with cream cheese
ramen noodles