If you're overweight and over 55 with a high risk of heart disease, you're about a quarter less likely to stick with the Mediterranean diet for three years than someone your age who isn't overweight.

People who follow the Mediterranean diet more closely—like eating more veggies, fish, and olive oil—tend to have a lower chance of dying from heart disease, and every little step up in following the diet cuts their risk by about 9%.

If you're an adult with obesity, sticking more closely to a low-carb diet might help lower your top blood pressure number and overall cholesterol a little — but the data isn't strong enough to say for sure, and it doesn't seem to affect your bottom blood pressure number or triglycerides.

People who eat like Mediterraneans—lots of veggies, olive oil, fish, and nuts—tend to have fewer heart problems, no matter where they live or how much money they make, so this way of eating might help heart patients everywhere.

If you're an adult between 20 and 50 who's obese, eating fewer carbs and more fats might be linked to healthier blood pressure, better cholesterol, and lower triglycerides — but we can't say for sure that the diet caused these benefits from this study alone.

Even though low-carb diets can improve some health numbers, in people who are already obese, sticking more closely to a low-carb eating pattern might actually go hand-in-hand with having more body fat and a higher weight.