It’s hard to improve your ratio by raising your HDL since changing your HDL levels isn’t easy., Lowering your triglycerides, however, is the easiest thing in the world to do, and will have the same effect on your ratio as bringing your HDL up. How do you lower triglycerides? Simple. With a low-carb diet. Triglycerides drop like a rock 99 percent of the time on a low-carb diet, such as the higher-fat version of the Mediterranean diet