So you're telling me that if you eat McDonald's for every meal for thirty years, you'll experience no health issues as long as you exercise enough? Tell you what: let's have this conversation again in thirty years, provided you're still around.

An anecdote about a personal experience over a relatively short period of time is of limited value to me. Study after study has shown that the western diet has severe detrimental effects in the long run, including diabetes, heart disease, and cancer. Can you mitigate some of that by exercising more? Absolutely. But thinking that you can put whatever you want into your body with no ill effects as long as you exercise enough is ridiculous.