Drive-thru diet: Nashville grandpa plans to eat McDonald’s for 100 days in weight-loss attempt
A 57-year-old man from Nashville, Tennessee eats nothing but McDonald’s for 100 days in an unconventional effort to shed some pounds.
Kevin Maginnis documents his journey on his TikTok account at @bigmaccoaching.
His plan is to order three meals a day from McDonald’s, eat only half of each – and save the other half for his next meal.
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“I woke up this morning and weighed 238 pounds,” Maginnis said in his first video on Feb. 21. “I decided that this is absolutely unacceptable.”
He added that while many people will think he’s crazy, he’s decided to eat only McDonald’s fast food for the next 100 days — while practicing portion control.
A man from Nashville, Tennessee (not pictured) eats nothing but McDonald’s for 100 days in an unconventional effort to shed some pounds. “I am 57 years old,” he said on TikTok. “I have children and grandchildren.” (iStock)
In another TikTok video, Maginnis shared more about his motivation.
“I am 57 years old. I have children and grandchildren,” he said.
“I know some 60-year-olds who are overweight, but I don’t know anyone who is overweight at 80. I want to stay here as long as possible, and I think it will help me lose some of this excess weight. So do that. “
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Ten days into his trip, Maginnis has already lost 12-½ pounds, from 238 to 225.5, he said.
In his videos, Maginnis shares what he orders each day, complete with rhyming puns (“can eating a McGriddle make you small in the middle?”).
Ten days into his trip, Maginnis has already lost 12.5 pounds.
His go-to meals include the Sausage Egg and Cheese McMuffin with Hash Browns, the McGriddle with Canadian Bacon, the Bacon Double Quarter Pounder with Cheese, Chicken McNuggets with Fries, and a McChicken in a McDouble (all cut in half, of course).
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He even indulges in the apple pie and hot fudge sundae, but opts for water instead of soda.
His McDonald’s experiment has garnered national attention — and a growing TikTok following, with 20,600 and counting.
Fox News Digital reached out to Maginnis for comment.

Some of McDonald’s Maginnis’ favorite items include the Sausage, Egg, and Cheese McMuffin, the Bacon Double Quarter Pounder with Cheese, and Chicken McNuggets with Fries. (Getty Images/iStockphoto)
As followers follow his journey, people have provided helpful tips, from creative menu suggestions to the best ways to reheat leftovers. (A tip Maginnis received: Use an air fryer instead of a microwave to avoid soggy fries.)
Maginnis also shares videos of his daily weigh-ins, which show a consistent downward trend since he started his new diet plan.
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Ultimately, Maginnis said he wants to prove that people can lose weight just by eating McDonald’s if they control their portions.
“It’s not so much what we eat, but the amount we eat that really lifts us up,” he added.
Drive-thru diet doesn’t produce lasting results, dietician says
Lindsay Allen, MS, RDN, a Florida-based dietitian who specializes in metabolic health and weight loss, sees some significant problems with the fast food meal plan.
“Ultimately, the person’s metabolism can drop by up to 30% if they restrict calories for too long,” she told Fox News Digital via email.
“Then when the person starts eating normal portions again, they will immediately put on weight again. This is exactly why fad diets and low-calorie diets fail.”

A dietitian said a Nashville man’s fast-food diet is unlikely to lead to long-term weight loss. (iStock)
The second problem, Allen said, is that Maginnis is missing out on important nutrients the body needs for optimal health, which can lead to increased food cravings.
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“When the brain senses that the body is not getting enough important nutrients and minerals, the hunger hormones will ramp up in an attempt to get more essential nutrients,” she said.
“If you give your body nothing but cheap, processed food, it will sense this and encourage you to take in more food.”
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Ultimately, Allen said, Maginnis just practices calorie restriction to prove that weight loss is possible no matter what you eat. “Technically he’s right, but this only works in the short term and will fail later on.”