This is a valid fear. I was in the same boat. Getting into great shape at 30 and having an extremely active life did me little favors when I simultaneously turn

This is a valid fear. I was in the same boat. Getting into great shape at 30 and having an extremely active life did me little favors when I simultaneously turned 40, went to school, and spent a lot more time in front of the computer. At this point, maintaining a healthy weight means eating less than half of the amount of food I ate at a healthy weight at 38, and it needs to be much more healthy. I'm fortunate in that I learned to cook and eat whole, healthy food early in life but despite being delicious and feasible, my diet is much, much more limited.