Top 20 Most Insane Celebrity Weight Loss TransformationsBy Tammy Salt / August 21, 2019 12. Gabourey Sidibe prevention.com When it comes to extreme weight loss transformations, Gabourey Sidibe is the perfect example of that. Through hard work and dedication, Gabourey was able to get her life back on track. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20