Only low-carb diets raise 'good' cholesterol (HDL) in obese people without diabetes—even if they lose the same amount of weight as people on low-fat diets.

If you're overweight and have high 'bad' cholesterol, eating fewer carbs for four weeks might help lower your bad cholesterol and improve your overall cholesterol balance better than eating low-fat, high-carb foods.

If you're at risk for metabolic problems, swapping butter or fatty meats for olive oil or avocados doesn't drop your 'good' cholesterol as much as swapping them for bread or sugar.

High intake of dietary saturated fats elevates circulating low-density lipoprotein (LDL) cholesterol levels in humans.

Eating more cholesterol raises both 'bad' and 'good' cholesterol a little bit, but doesn't change their ratio much, which is important for heart health.

Eating cholesterol doesn’t reliably raise bad cholesterol, and when it does, it also raises good cholesterol just as much, so your overall heart risk doesn’t change.