The phrase "crappy diet" refers to a way of eating that is poor in quality and unhealthy. It usually includes consuming too much junk food, sugary or processed foods, and not enough nutritious, balanced meals. Full definition
And some people actually do this, by eating junk and crappy diets until they literally develop accelerated aging, and ultimately death. (thepsoriasisprogram.com)
However — and this part is miraculous — when Dr. Panda and his team restricted the time the mice were fed the exact same crappy diet to 12 hours (instead of allowing them to eat whenever they wanted), none of the negative health benefits occurred; the Time - Restricted Fed mice were 70 % leaner, lived longer and were free from diabetes or heart disease. (taliand.com)
I resent the commercial dog food companies because they like to push the «don't feed your dog people food» Granted there are so many people on crappy diets themselves and if they fed their dog the same... oh well that's another story. (homemadedogfood.com)