Is eating a lot of fast food bad for your health if you're still skinny and active?

Anonymous
If you eat a lot of fast food and unhealthy food what parts of your body is it effecting if you aren't overweight?

I eat quite a bit maybe about 3 or four combos a week on average , but I exercise quite a bit and do a lot of walking for my job, is that still real bad for me?
Is eating a lot of fast food bad for your health if you're still skinny and active?
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