If one is running 50 miles per week one needs to orient eating around the runs. It's difficult to run right after a full meal. The result tends to be restricted eating to have a comfortable run in the first place.
PS: A bunch of extra work is near mandatory to maintain weekly mileage like this. Proper stretching and recovery--maybe some yoga. Lots of distractions from eating too much in the first place.
You don’t really need to do anything extra at 50. 50 is a basic baseline for a lot of folks running 3-3:30 marathons. I stretch for about 3 minutes after I run, and little else, for instance, and I’m at 60-70mpw, old, and a bit overweight.
I know very few people at this mileage doing serious “extra” work.
PS: A bunch of extra work is near mandatory to maintain weekly mileage like this. Proper stretching and recovery--maybe some yoga. Lots of distractions from eating too much in the first place.