system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do bodybuilding supplement shops sell Ben and Jerry's ice cream?

I've seen Ben & Jerry's being referenced regarding body-building and working out all over the internet too, such as fitness forums and even /fit/ on 4chan. I then saw it for sale at a local body-building supps shop; the kind of place to sell protein powder. I think the ice cream is delicious, but it must be horribly unhealthy. With the amount of sugar and fat that must go into those tubs, especially with flavours such as "cookie dough", how on earth can the fattiest, sweetest ice-cream on the market be constructive towards a healthy diet?
gpt
If you've got a heavy exercise regimen, it's easy to introduce some extra calories into your diet without any problems. Bodybuilders and serious athletes can struggle to eat enough calories.

The idea that sugar and fat are bad for you holds if you're an average Joe with a desk job. When you're 250 pounds of muscle and working out daily, you've got different rules.