Grandma, 73, shows off unbelievable weight loss photos, becomes viral sensation

A 73-year-old grandmother is showing off her incredible transformation on social media, a lifestyle change that's caused her to become an Instagram sensation.

Joan MacDonald, 73, weighed 198 pounds and wore a size 22 before she began her diet and exercise program in January 2017, Fox News reported.

The retired grandmother, from Ontario, Canada, told the Daily Mail that she had been taking several medications to deal with various health issues and had knee problems that made it difficult to get up the stairs.

That led MacDonald to completely overhaul her lifestyle, working with her daughter, Michelle, to create a diet and exercise program she could track easily from her iPhone.

"I was on a meal plan set up by Michelle with 'X' number of calories; primarily protein, carbs and good fats, and as the weight and inches came down my intake of food went up," MacDonald to the Daily Mail.

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MacDonald dropped 55 pounds in about a year, landing at a size 16 and reaching a level of health that allowed her to stop taking her medications, which she took for high blood pressure, high cholesterol and other conditions.

"This fitness journey will undoubtedly improve my quality of life as I move deeper into old age. I'm very grateful for that," she told the Daily Mail.

But the 73-year-old didn't stop there. Her fitness journey has continued since she reached her target weight, and it's now the source of a highly popular Instagram page, "Train With Joan." Co-managed by Michelle, the account tracks MacDonald's fitness journey, including videos from her workouts, and shares before-and-after comparisons.

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"You can't turn back the clock but you can wind it up again!" MacDonald says in the bio for her page, which now has more than 85,000 followers.

"People are very complimentary and somewhat surprised that I've kept it off this long and I'm still changing," MacDonald told the Daily Mail. "I have more muscle definition now than when I first lost the weight."

The grandmother said she now often receives compliments from younger men and women, as well as her husband and other family members. Still, she noted that her lifestyle change has meant much more to her than just other people's kind words.

"I have an easier time staying away from junk or fast foods, and as for exercise, I will keep at it because there's always room for change and improvement," she told the Daily Mail.