Social media star Lil Terrio is slimming down after making some big changes in his life ... and his weight loss journey is rooted in his improved diet and ramped-up workouts.

Lil Terrio's manager, Jon Barclan, and personal trainer, Kipp Luster, tell TMZ ... Terrio has lost a shocking amount of weight in the last 2 months. He's 231 lbs. now, down from 360 lbs.!!!

Nearly 130 lbs. lost in about 60 days, means dude's shedding just over 2 lbs. per day -- and Terrio's team says that's thanks to working out 6 times a week, sometimes hitting the gym even twice a day. He's also doing high-intensity interval training to get his heart rate up and burn fat.

We're told Terrio's also reaping the benefits of a custom meal plan curated by his trainer ... a diet high on protein and fiber, and low on carbs. Terrio's mostly eating seafood and chicken, plus a lot of fruits and vegetables, while staying away from beef and pork.

The results are happening pretty fast, we're told Terrio completely changed his diet starting Sept. 1 ... retraining his taste buds after being addicted to carbs and sugars and needing about 3 weeks to settle into his new diet.

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