'I'm eating McDonald's everyday for 100 days to prove I don't gain weight' Most people go on health kicks at the start of January and ditch fast food for fruit and vegetables.
Many said that even if he didn't gain weight, the food challenge may not be great for his health, as one person said: "You can stay the same exact weight and still clog your arteries to the point of a heart blockage.
Zach started the fast food eating challenge on November 27, as he took to his Instagram to share a video of himself eating a McDonald's hamburger.
However, one man has done the opposite, and is eating McDonald's everyday for 100 days to "prove he doesn't gain weight".
He told his 22,000 followers: "Day 1 eating McDonald's every single day for 100 days to prove I will not gain weight.".
