The 73-year-old woman who lost 55 pounds and became a viral sensation

Think it's too late to change your body once you're over 50? Think again. In October, 73-year-old Joan MacDonald became an internet inspiration after showing off her incredible transformation.

"For many decades, I was more often overweight than at a healthy weight," MacDonald told The Daily Mail. "I was on medication for high blood pressure, high cholesterol, and acid reflux. My arthritis was acting up pretty bad."

Concerned about her health, MacDonald's daughter taught her mom how to use her iPhone to track her meals and exercise activity. That tool helped drive her to eat more protein and healthy fats, and go to the gym four or five days a week. And after making those major changes to her lifestyle, MacDonald lost 55 pounds in a year, gained plenty of muscle, and now helps others reach their fitness goals, no matter how old they are.

"For those who truly feel at a loss, I'd say change one thing with your food intake, one exercise to do, and each week add something new," she said. "Don't expect miracles right away, take it slow and steady but keep building."

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