10 Foods I Eat on Repeat to Stay Lean Over 45 1. Lean Ground Beef Red meat is one of the most complete sources of protein—rich in essential amino acids that help preserve muscle and support a healthy metabolism. 2. Turkey & Chicken At the start of each week, I roast chicken breasts with olive oil and Spike seasoning—simple, easy, done. I also sauté lean ground turkey for a quick, versatile protein to have on hand. 3. Cottage Cheese I don’t eat a ton of dairy, but I’m addicted to Good Culture cot