Eating Keys

Why is it you can wake up one morning and not like any of the foods you have eaten all of your life? There used to be only a few foods you couldn't threaten me with death to make me eat. Oatmeal, coconut the main two. The odor of either turns me into a gagging machine. Now, as I have gotten oooolder (50 on the 4th) there are only a few on my list to eat. Most are vegetables. I no longer like noodles of any kind and I have really lost the taste for meat. I wonder why? After two or three weeks I get this over whelming urge for something fried, eat it and then am off the meat again. I feel like a two year old who will live for months on a diet of paper and peanut butter.Does age change our eating habits or is it a mind thing?