I had no idea how shitty fast food (McDonald's, KFC etc) was making me feel until I recently gave it up. I'm trying to eat healthier (and vegan-er) so the first thing I did was give up my fast food habit. A few things I found interesting about the process:
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Holy shit is this hard. I don't know if I'm just weak-willed or they put some seriously addictive stuff in there but the cravings are almost unbearable.
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Other than that I feel amazing after only a month. I have more energy, a better mood, my digestive system is better, I look healthier. All this makes the cravings worth it and those are slowly getting less terrible.
I highly recommend giving up fast food.
It's also really expensive for what you get. You're also paying for the "fast" service and supply chain too in the price.
Like a burger, fries, and a drink goes for $9 to $11 for one meal for one person.
Getting takeout from a cheaper local restaurant will go farther and possibly less likely make you feel like you have a lead ball in your stomach.