Can your diet beat your genes? New study links five diets to longer life | Health News

Genes can influence how long we live, but they don’t act alone. According to a new study published in Scientific advancespeople who closely followed five well-established healthy diets lived significantly longer, regardless of their genetic risk of having a shorter lifespan. The findings highlight how diet can modify hereditary risk and reshape long-term health outcomes.

About the study

In the study entitled “Healthy dietary patterns, longevity genes and life expectancy: a prospective cohort study”, Researchers tracked the diets of more than 100,000 people over many years, using detailed questionnaires to assign dietary scores based on the extent to which individuals followed certain healthy eating habits. They then compared life expectancy at age 45 among people with the lowest and highest adherence to these diets. Importantly, they also looked at a person’s genetic longevity risk score, a measure of how likely a person is to live longer based on their genetic makeup.

They concluded that people with healthy diets tend to live longer, whether or not they have a genetic advantage or disadvantage, and that in some cases diet seems to make a bigger difference than genes.

The 5 diets observed in the study

Here are the eating habits associated with a significant increase in life expectancy:

1. Alternative Healthy Eating Index-2010 (AHEI) – Emphasizes fruits, vegetables, whole grains, nuts and seeds; limit sugary drinks and red meat

2. Alternative Mediterranean Diet (AMED) – A version of the Mediterranean diet emphasizing plant foods, fish, and healthy fats.

3. Healthy Plant-Based Diet Index (hPDI) – Focuses heavily on whole plant foods and reduces animal products and processed foods

4. Dietary Approaches to Stop Hypertension (DASH) – Designed to lower blood pressure with plenty of fruits, vegetables and low-fat dairy products

5. Diabetes Risk Reduction Diet (DRRD) – Aim to improve insulin sensitivity with high-fiber, low-glycemic foods and coffee, while limiting red and processed meats and sugary drinks.

All five diets prioritize non-starchy vegetables, whole grains and legumes, while promoting healthy fats and limiting alcohol alongside red and processed meats. Research consistently links this eating pattern to decreased rates of chronic disease. Fiber-rich plant foods help feed beneficial gut bacteria, healthy fats support and protect blood vessels, and reducing sugar intake reduces the risk of type 2 diabetes and heart disease. Together, these effects help reduce the risk of all-cause mortality, meaning a lower likelihood of dying from any cause.

How much longer could you live?

When researchers compared the highest 20 percent of adherents with those at the bottom, they found striking differences in life expectancy at age 45:

• Men lived on average 1.9 to 3 years longer
• Women lived on average 1.5 to 2.3 years longer

The associations remained strong even after adjusting for longevity-related genetic susceptibility, showing that diet can compensate for genetic predispositions to some extent.

What does this mean for you

Even though you can’t change your genes, you can choose what you eat. Following one of the five diets highlighted in this research could help tip the scales in your favor and increase both your life expectancy and your health.