Eating fewer carbs might raise your 'good' cholesterol a little, especially if you replace them with fats or proteins, but it could also raise your 'bad' cholesterol, so it's not clear if this is truly helpful for your heart.

Eating fewer carbs might help boost good cholesterol and lower blood fats in people with higher body weight, but it doesn’t seem to change overall or bad cholesterol much.

Eating very few carbs—like on a strict keto diet—can raise your 'bad' cholesterol, especially if you're replacing those carbs with lots of saturated fats like butter and red meat.

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.

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.

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.