People who eat healthy diets low in carbs and fat tend to have certain chemicals in their blood—more of one called 3-indolepropionic acid and less of another called valine—and these chemicals might be linked to a lower risk of heart disease.

People who eat healthy low-carb or low-fat diets tend to have certain chemicals in their blood—like more 3-indolepropionic acid and less valine—that are connected to better heart health, such as lower bad fats, higher good cholesterol, and less body inflammation.

People who eat healthy low-carb or low-fat diets tend to have certain natural body chemicals that are linked to better heart health—like lower bad fats and higher good cholesterol.

People who eat healthy low-carb or low-fat diets tend to have certain natural chemicals in their bodies that are linked to better heart health—like more of one helpful compound and less of another—and it might be because these diets work in similar ways inside the body.

Scientists have created a kind of metabolic 'fingerprint' from what people say they eat, and it turns out this fingerprint matches real eating habits and also links to heart disease risk—so it might be a reliable way to measure diet without asking people again.

Scientists have created a score based on what people say they eat, and it turns out this score matches real chemical signs in the body and can predict heart disease risk — so it might be a good way to tell if someone’s diet is healthy without needing blood tests.