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.

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.

Eating healthy low-carb or low-fat meals might lower your risk of heart disease by about 13–15%, but eating unhealthy versions of those diets could raise your risk by 14–17%.

If obese adults in Iran eat fewer carbs and more fat, they might be less likely to have a group of health problems like high blood pressure and high blood sugar that raise heart disease risk.

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.