In the 1970s and 1980s, running 100-140 miles a week, I watched sugar and white flour, but ate everything else. It was only when I stopped racing, and watching my diet that I had weight issues.
I remember an article in the Runner magazine, where Nancy Clark reviewed Bill Rodgers' diet for a week. She was mortified. Bill, and this was in 1979-80, was eating whatever he could put into his mouth. From pickle juice (that was actually good for hydration and minerals) to lobster, to mayonnaise on cold pizza. As Frank Shorter noted, Bill Rodgers was an anomaly in many ways.
Then, Americans became obsessed with food. And, not in a good way. If one spends time in Europe, as I did this year, one notes that portions are much smaller, food is healthier, on average and that somehow, people find out how to get the right foods inside them. The countries that have the biggest challenges with diabetes: US, China and India, are undergoing changes in how food is collected and junk calories seem to be the name of the game.
Cait Chock's message here, after interviewing athletes is to figure out what your goals are, and set up a plan, but also, eat some fun things once in a while. It is the combination of fitness and nutrition that will keep you healthy for a long time to come.