If you think about it, this makes sense:
When they later asked the students about their attitudes to a range of health behaviours (eating, exercise, hygiene, and going to the doctor’s for checkups), they found that those who had been given the dualism passage were significantly less health conscious. […] Even more extraordinary is that this effect appears to work both ways. When subjects in another study were shown pictures of unhealthy food, they later reported holding significantly stronger dualistic beliefs than those shown pictures of healthy food.
Of course, if you think your body is temporary and your mind lives forever, or that the brain runs on magic instead of chemistry, then it doesn’t matter what you eat.