Genetic testing can certainly screen for certain genetic variants to determine if someone might be more predisposed to a disease — and many people use genetic testing in just that way. But like we’ve already seen, genetic testing can be used for much more, including informing lifestyle and food choices to address root causes of illness and disease before they even start. It’s important to understand which genetic tests focus on food choices and lifestyle changes — what we call nutrigenetic tests — and medical genetic tests that look for rare genetic variants that may by themselves cause disease.