Browse the evidence

Low intake of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) significantly amplifies the cardiovascular disease (CVD) risk associated with having a family history of CVD, whereas low intake of other polyunsaturated fatty acids (linoleic acid and alpha-linolenic acid) does not show this interaction.

If you have a family history of heart disease, your risk is significantly higher if your levels of EPA and DHA (found in oily fish) are low. While general healthy fats are good, ensuring adequate intake of EPA/DHA is specifically critical for you to mitigate this genetic risk. Aim to consume oily fish regularly to raise these biomarkers.

A high carbohydrate-to-fat intake ratio (specifically high carbohydrate and low fat intake) is associated with lower long-term HDL-cholesterol levels and a significantly increased risk of incident hypo-HDL-cholesterolemia.

If you eat a diet very high in carbohydrates and very low in fat (like a traditional Korean diet heavy in white rice), your HDL 'good' cholesterol levels tend to be lower over time, and your risk of developing low HDL increases. To support healthy HDL levels, ensure your carbohydrate intake is balanced with adequate fat intake, rather than maximizing carbs while minimizing fat.

Higher dietary fiber intake is positively associated with whole-body insulin sensitivity (Matsuda-IS) independent of cardiorespiratory fitness and waist circumference.

Increase your intake of dietary fiber, particularly from whole-grain bread and vegetables. This improves insulin sensitivity regardless of your current fitness level or waist size. Aim for higher fiber consumption as a standalone strategy to support metabolic health.

The relationship between fat mass (FM) and fat-free mass (FFM) during weight change is consistent across sex and ethnicity, with a constant (C) of approximately 9.7, indicating that the proportion of weight lost as fat depends primarily on initial FM rather than demographic factors.

Your body's tendency to lose fat versus muscle during weight loss is determined by how much fat you currently have, not by whether you are a man or woman, or by your ethnicity. If you have more fat mass, you will lose a higher proportion of your weight as fat. This rule applies consistently across different demographic groups.

Dietary protein quality is determined by essential amino acid content and digestibility (DIAAS), with plant proteins generally having lower bioavailability than animal proteins due to antinutrients.

Understand that plant proteins are generally less bioavailable than animal proteins due to antinutrients. To maximize benefit, eat a variety of plant proteins (legumes, grains, nuts) and consider processing methods (heating, fermentation) that improve digestibility. This is especially important for older adults.

Rapid weight loss from GLP-1 and dual/triple agonists can lead to significant loss of lean muscle mass, necessitating strategies to preserve muscle.

While GLP-1 and dual/triple agonists are effective for fat loss, they can also cause significant muscle loss. Patients should consider resistance training and discuss muscle-preserving strategies with their healthcare provider.

Individuals with muscle-specific insulin resistance (Impaired Glucose Tolerance, IGT) achieve greater metabolic improvements on a low-fat, high-fiber diet, whereas those with liver-specific insulin resistance (Impaired Fasting Glucose, IFG) respond better to a monounsaturated fat-enriched diet.

If you have insulin resistance, your specific metabolic defect determines which diet works best. If your blood sugar spikes after meals (Impaired Glucose Tolerance, often linked to muscle insulin resistance), a low-fat, high-fiber diet is likely superior. If your fasting blood sugar is high (Impaired Fasting Glucose, linked to liver insulin resistance), a diet emphasizing monounsaturated fats may be more effective. Standard generic diets often fail because they ignore this distinction.

High intake of saturated fatty acids (SFA) from modern domesticated animal products and dairy increases LDL cholesterol and cardiovascular disease risk compared to ancestral diets rich in unsaturated fatty acids.

Prioritize unsaturated fatty acids (especially omega-3s) and fiber-rich foods over high-fat dairy and fatty cuts of domesticated meat. This shift aligns your diet with evolutionary norms and helps lower LDL cholesterol, reducing cardiovascular risk.

High intake of saturated fatty acids from modern diets is linked to endotoxemia and inflammation, whereas unsaturated fatty acids do not produce this response.

Be aware that high-fat meals, particularly those high in saturated fat, can trigger an inflammatory response (endotoxemia). Choosing unsaturated fats helps avoid this inflammatory spike.

High consumption of refined cereal grains (white rice/refined wheat) significantly increases the risk of type 2 diabetes in Asian Indians by elevating dietary glycemic load and contributing to visceral obesity.

Reduce your intake of polished white rice and refined wheat. These foods make up half your calories and spike your blood sugar, driving diabetes risk. Swap them for whole grains, millets, or high-fiber rice varieties to lower your glycemic load without abandoning your staple foods.

Higher socio-economic status (SES) and higher educational attainment are associated with lower absolute and relative intake of energy, carbohydrates, sodium, and saturated fats, but higher intake of trans fats in men and monounsaturated fats (MUFA) in women.

In urban Colombia, lower socioeconomic status and education are linked to higher intake of energy, carbohydrates, sodium, and saturated fats, which increases chronic disease risk. However, higher education in men is also linked to higher trans fat intake, and in women, higher monounsaturated fat intake. Public health policies should target these specific demographic-dietary intersections rather than assuming uniform dietary improvements with wealth or education.

A short-term high-fat diet (65% energy from fat) for 5 days reduces large VLDL particles and small HDL particles (HDL-3/4) in men with overweight/obesity, which may be beneficial for cardiovascular health.

A short-term high-fat diet (65% of calories from fat) in sedent overweight men can improve specific lipid subfractions (reducing large VLDL and small HDL) which are linked to lower cardiovascular risk. However, this is a short-term effect in a controlled setting and should not be interpreted as a long-term dietary recommendation without medical supervision.

A higher proportion of saturated fatty acids relative to total fat intake (SFA/TFAT) is associated with a 23% increased risk of all-cause mortality, whereas a higher proportion of polyunsaturated fatty acids relative to total fat (PUFA/TFAT) is associated with a 14% reduced risk, mediated partially by the neutrophil percentage-to-albumin ratio (NPAR).

To support longevity, focus on the ratio of fats in your diet rather than just cutting total fat. Ensure that polyunsaturated fats (found in fish, nuts, seeds, vegetable oils) make up a larger proportion of your total fat intake, while saturated fats (found in red meat, butter, cheese) make up a smaller proportion. This shift is associated with lower mortality risk, potentially by reducing systemic inflammation.

High starch intake (top quartile, >28.8 E%) is associated with a significantly higher risk of cardiovascular disease and all-cause mortality compared to moderate intake (22.8-25.3 E%), creating a U-shaped risk curve.

Aim for moderate starch intake, roughly 20-30% of your total daily energy, rather than very low or very high levels. This range is associated with the lowest risk of cardiovascular disease and death in this population. Focus on the source of starch (e.g., bread, potatoes) as the study notes specific protein associations.

Pasta consumption is associated with reduced intake of added sugars and saturated fats in adults, and reduced saturated fat in children, compared to non-consumption, while energy intake remains similar.

Eating pasta is linked to eating less added sugar and saturated fat than people who don't eat it. You can include pasta in your diet without worrying about increasing your sugar or fat intake.

Fat-restricted (RF) diets lead to greater overall fat mass loss and greater reduction in insulin resistance compared to carbohydrate-restricted (RC) diets, despite both diets being isocaloric.

If you are trying to lose fat, both low-carb and low-fat diets work if you eat the same number of calories. However, a fat-restricted diet might lead to slightly more fat loss because your body burns extra energy trying to turn excess carbs into fat. Don't obsess over cutting carbs; focus on the total energy balance and the energy cost of processing nutrients.

Replacing saturated fats with polyunsaturated fats (omega-3 and omega-6) reduces cardiovascular risk, whereas restricting total fat or saturated fat without replacement does not improve cardiovascular outcomes.

Stop fearing dietary fat. Instead of just cutting back on saturated fats (like those in red meat and full-fat dairy), actively replace them with polyunsaturated fats. Eat fatty fish at least twice a week, use olive oil, and include nuts and seeds. This substitution, rather than simple restriction, is what lowers your cardiovascular risk.

In adults with prediabetes, a high-carbohydrate (50% energy) diet reduces fasting glucose more effectively than a reduced-carbohydrate (35% energy) diet when both are calorie-restricted, despite similar weight loss.

If you have prediabetes, you do not need to severely restrict carbohydrates to improve your fasting blood sugar. A diet providing about 50% of your calories from carbohydrates, focusing on high-fiber foods like whole grains and vegetables, can lower fasting glucose better than a lower-carb diet, provided you are in a calorie deficit. Focus on the quality of carbs (fiber) rather than just cutting them out.

The quality and source of macronutrients (e.g., plant-based proteins, unsaturated fats) are more important for long-term health outcomes than the specific macronutrient ratio (low-carb vs. low-fat).

Don't just count macros; focus on the quality of your food. Replace refined carbohydrates and saturated fats with whole grains, vegetables, nuts, and unsaturated fats. This improves long-term health more than just restricting calories.

Higher intake of fish, marine n-3 fatty acids, folate, whole grains, dietary vitamins E and C, beta carotene, alcohol, fruit, and fiber is associated with a moderate reduction in coronary heart disease risk.

Increase intake of fish, marine n-3 fatty acids, folate, whole grains, dietary vitamins E and C, beta carotene, alcohol (in moderation), fruit, and fiber, as these are moderately associated with a lower risk of coronary heart disease.

Higher intake of linolenic acid (an N-3 fatty acid from plants) is inversely associated with the risk of myocardial infarction, independent of other dietary and non-dietary risk factors.

Include sources of linolenic acid (an N-3 fatty acid found in plants) in your diet. This study found a significant inverse association between linolenic acid intake and myocardial infarction risk, suggesting it may offer specific protective benefits for heart health.

Healthy older men require a greater relative protein intake (~0.40 g/kg body mass) per single meal to maximally stimulate myofibrillar protein synthesis compared to younger men (~0.24 g/kg body mass).

If you are an older adult, you likely need to eat more protein per meal than a younger person to maximize muscle building. Aim for roughly 0.4 grams of high-quality protein per kilogram of body weight in a single meal (e.g., ~28g for a 70kg person), rather than the lower amounts often recommended for younger adults.

Replacing saturated fatty acids (SFA) with polyunsaturated fatty acids (PUFA) modestly lowers coronary heart disease (CHD) risk, whereas replacing SFA with carbohydrate yields no benefit.

Do not simply cut saturated fats (like butter or red meat) unless you are replacing them with unsaturated fats (like nuts, seeds, or fish). Replacing saturated fats with refined carbohydrates (like white bread or sugar) offers no heart health benefit. Focus on the quality of the replacement nutrient, not just the reduction of fat.

Male endurance athletes oxidize a significantly greater amount of leucine during submaximal exercise compared to female endurance athletes, suggesting higher protein utilization for energy in males.

Men may burn more protein for fuel during endurance exercise than women do at the same relative intensity. This suggests men might need slightly higher protein intakes than women to offset this increased oxidation, although total protein needs are still driven by the need to maintain nitrogen balance.