FTA:

Scientists found that after exercising for several weeks, formerly sedentary study participants were more likely to choose foods like lean meats, fruits and vegetables, while preferences for fried foods, sodas and other unhealthy options decreased.

Participants were instructed not to change their diets in any significant way, but it happened anyway.

[…]

The exercise sessions consisted of 30 minutes of aerobic exercise at 65-85 percent of the person’s age- and gender-specific maximum heart rate, along with a 5-minute warmup and a 5-minute cool down.