Eating fewer calories—no matter if you eat more fat, protein, or carbs—helps lower bad cholesterol, insulin, and triglycerides, but diets with more protein lower insulin a bit more, and diets with...

Obese adults who eat high-protein diets have lower triglycerides, lower total cholesterol, lower LDL cholesterol, and stable HDL cholesterol compared to those who do not.

When overweight or obese adults follow a short-term low-calorie diet with 30% protein, their LDL cholesterol decreases more and they lose less muscle mass than when they follow a low-glycemic-index diet with 20% protein, even when the total weight lost is the same.

If you're overweight and have type 2 diabetes, cutting carbs and eating more protein for 6 weeks can lower your blood fats (triglycerides) 18% more than the usual diabetes diet—even if you lose the same amount of weight—meaning your body handles fats better.

If you're an adult with obesity and you eat fewer carbs on a low-carb diet, you might lose more weight and see better cholesterol numbers in just a few months.

In overweight or obese adults, eating a short-term diet high in protein and restricted in calories lowers LDL cholesterol from 3.3 to 2.8 mmol/L, while a low-glycemic-index diet does not lower LDL cholesterol to the same extent.