Ciara Appelbaum I tried to eat fast food for every meal for a week and failed miserably. I felt sick after the first day. Eating nothing but fast food made me feel sluggish, bloated, and even gave me heartburn. Who doesn't love fast food? Sure, it may not be the healthiest for you, but it's quick, cheap, and often delicious.See the rest of the story at Business InsiderNOW WATCH: Here's the ultimate NYC burger tourSee Also:4 potential health risks of going vegan — and how to prevent them7 scary things that can happen when you lose weight too quicklyA dermatologist shut down someone who shamed her for eating ice cream while having acne — and people had her back