Browse the evidence

Post-procedure dietary quality (low processed foods, high fiber/vegetables) is more critical for sustained weight loss than the specific macronutrient ratio (low-carb vs. low-fat).

Don't obsess over whether you are low-carb or low-fat. Focus on eating whole foods, vegetables, and fruits, and keeping processed foods and added sugars under 10% of your calories. This quality matters more than the specific diet label.

In older Asian populations, a vegetable-based low-carbohydrate diet (high unsaturated fat/plant protein, low refined carbs) is associated with increased all-cause and cardiovascular disease (CVD) mortality, whereas a meat-based low-carbohydrate diet (high saturated fat/animal protein, refined carbs) is associated with decreased mortality.

For older adults in Asian populations, simply reducing carbohydrates is not enough; the source of the remaining calories is critical. A 'vegetable-based' low-carb diet (emphasizing unsaturated fats and plant proteins while reducing refined carbs) was linked to higher mortality. Conversely, a 'meat-based' low-carb diet (emphasizing animal proteins and saturated fats) was linked to lower mortality. This suggests that for this demographic, replacing refined carbs with animal products may be beneficial, whereas replacing them with plant oils and proteins might not be, potentially due to cooking methods (high-heat frying of plant oils) or specific nutrient profiles.

Iso-caloric substitution of 3% of total energy from animal protein for saturated fat, mono-unsaturated fat, or carbohydrates is associated with a statistically significant increase in all-cause and cardiovascular mortality.

If you are replacing 3% of your daily calories with animal protein (e.g., by eating more meat or dairy) and reducing fats or carbs, this study suggests your risk of dying from heart disease or any cause may increase. To mitigate this, prioritize plant-based proteins or ensure that the animal protein replaces less healthy components like refined sugars or saturated fats, though even then, risk remains elevated compared to plant-based swaps.

Co-ingesting a mixture of three microbial proteases (OPTIZIOME P3) with 25g of pea protein isolate significantly increases early postprandial plasma amino acid availability (0-2h) compared to pea protein alone in healthy adults.

If you are using pea protein, adding a specific microbial protease supplement (like OPTIZIOME P3) with your shake will help your body absorb amino acids faster in the first two hours after drinking it. This is particularly useful around workouts when you want a quick nutrient spike. The study used one capsule (31,875 HUT units) mixed with 25g of pea protein and 300ml of water. It was safe and did not cause stomach issues.

Orlistat causes mechanism-specific gastrointestinal adverse effects (steatorrhea, fecal urgency, flatulence) due to fat malabsorption, but these are generally manageable with dietary modification.

If you take Orlistat, you may experience oily stools, gas, or urgency, especially if you eat high-fat meals. To minimize these effects, limit your fat intake and take vitamin supplements as recommended. These side effects are predictable and manageable, but they require dietary awareness.

Below-average intake of energy and carbohydrates is associated with increased odds of hypertension and diabetes in socioeconomically vulnerable populations, contradicting the assumption that low-calorie diets are universally protective.

For older adults with limited income, eating very little or avoiding carbohydrates may actually increase your risk of high blood pressure and diabetes. Ensure you are consuming adequate energy and carbohydrates from nutritious sources to support metabolic health, as deficiency in this group is linked to higher disease odds.

Incretin-based therapies (GLP-1 and GLP-1/GIP RAs) induce substantial weight loss that is predominantly derived from fat mass, resulting in the relative preservation or improvement of lean body mass percentage and muscle quality, despite absolute reductions in lean mass.

If you are using GLP-1 or GLP-1/GIP medications for weight loss, expect to lose mostly fat. You will likely lose some muscle mass in absolute terms, but your body composition will improve because you are losing fat faster than muscle. To maximize this benefit, prioritize protein intake (1.2-1.6 g/kg/day) and engage in resistance training to signal your body to keep muscle tissue.

A longitudinal dietary pattern characterized by decreasing low-carbohydrate intake and increasing high-fat intake is associated with a lower risk of all-cause mortality in males, despite being associated with a higher risk of obesity.

For men in this demographic, shifting dietary habits to reduce carbohydrate intake (specifically from a low baseline) while allowing fat intake to increase over time is associated with a lower risk of death, though it comes with a higher risk of obesity. This suggests that for long-term survival, macronutrient quality and trajectory may matter more than total fat avoidance, but weight management remains a challenge.

A longitudinal dietary pattern characterized by decreasing very high-carbohydrate intake and a U-shape protein trajectory is associated with a significantly higher risk of diabetes in males.

For men, starting with a very high carbohydrate diet, even if you reduce it over time, may increase your risk of developing diabetes, especially if your protein intake follows a U-shaped pattern (high, then lower, then higher). This suggests that managing initial carbohydrate load and protein quality/timing is crucial for diabetes prevention.

A longitudinal dietary pattern characterized by decreasing very high-carbohydrate intake and moderate protein intake is associated with a higher risk of diabetes in females.

For women, starting with a very high carbohydrate diet, even if you reduce it over time, may increase your risk of developing diabetes, even if your protein intake remains moderate. This suggests that managing initial carbohydrate load is crucial for diabetes prevention in women.

Dietary protein intake and resistance exercise can attenuate fat-free mass and skeletal muscle loss during caloric restriction, but may not completely abrogate it.

To minimize muscle loss while dieting, aim for higher protein intake (potentially 2-3x the standard recommendation) and incorporate resistance training. Note that even with these efforts, some muscle loss is likely unavoidable during significant weight reduction.

Higher relative intake of dietary fat is inversely associated with heart failure risk, with Mendelian randomization confirming a causal protective effect.

If you are concerned about heart failure, this study suggests that restricting fat intake may not be the best strategy. Higher relative fat intake was linked to a lower risk of heart failure. You do not need to fear fat; instead, focus on a balanced diet. Consult your doctor for personalized advice, especially if you have existing heart conditions.

Higher relative intake of dietary protein is inversely associated with the risk of stroke, with Mendelian randomization confirming a causal protective effect.

If you are concerned about stroke, this study suggests that ensuring adequate protein intake may be beneficial. Higher relative protein intake was linked to a lower risk of stroke. Include protein-rich foods in your diet. Consult your doctor for personalized advice, especially if you have existing kidney conditions.

Higher intake of total fat, saturated fatty acids, monounsaturated fatty acids, and polyunsaturated fatty acids is associated with lower prevalence of covert brain infarcts and white matter hyperintensities, and higher cognitive scores (DSST).

Don't fear fat. This study found that people who ate more fat, including saturated, monounsaturated, and polyunsaturated fats, had less brain injury on MRI and better cognitive scores. Try incorporating more healthy fats into your diet, such as those found in nuts, seeds, and olive oil.

Baseline diet quality in weight loss trial participants is characterized by high saturated fat intake (median 12.1% of energy) and low dietary fiber (median 17.0 g/day), indicating a need for interventions to prioritize diet quality over simple energy restriction.

If you are trying to lose weight, do not just count calories or cut fat. Look at what kind of fat and carbs you are eating. Your baseline diet likely has too much saturated fat and not enough fiber. To improve your health outcomes, especially for heart disease and diabetes risk, you must improve the quality of your diet (more fiber, better fats) alongside any weight loss efforts.

Higher percentage of energy from plant protein is associated with a lower risk of stroke, but not overall CVD or CHD.

If you want to reduce your risk of stroke, increasing the percentage of your calories from plant-based proteins (like beans, lentils, nuts) may be beneficial. However, this did not lower the risk of heart attacks or overall cardiovascular disease in this study.

Relocation to redeveloped housing reduces added sugar intake, primarily from sugar-sweetened beverages, which may drive the observed reduction in waist circumference.

If you live in housing with poor water quality, you might be drinking more soda than you realize. Improving water access or quality can help reduce sugar intake and waist size.

Visceral adipose tissue (VAT) is a stronger predictor of mortality risk than overall BMI or subcutaneous adipose tissue (SAT), while SAT may be associated with lower mortality risk.

Do not rely on BMI alone to assess your health risk. Focus on reducing visceral fat (belly fat) through exercise and diet, as it is a stronger predictor of mortality than overall weight. Subcutaneous fat (fat under the skin) may be less harmful or even protective.

A 1-month VLCKD shifts substrate oxidation to favor fat and protein, resulting in a 62% fat mass loss and 38% lean soft tissue loss of total weight lost.

On a VLCKD, you will lose fat and muscle. In this study, 38% of the weight lost was lean tissue. To minimize this, ensure you are eating enough protein (1.2-1.5g/kg ideal body weight) and engaging in resistance exercise.

The cardiovascular benefits of low-carbohydrate diets depend on the quality of macronutrients used to replace carbohydrates, not the degree of restriction itself.

If you reduce carbs, ensure you replace them with healthy foods like fiber-rich grains or unsaturated fats, not saturated fats. Simply cutting carbs without considering food quality does not improve heart health.

Visceral adipose tissue (VAT) is a stronger independent risk factor for type 2 diabetes in women than in men, making waist circumference a more reliable predictor of risk in women.

For women, where you store fat matters more than your total weight. Visceral fat (around your organs) is a much stronger predictor of diabetes than BMI. Focus on reducing waist circumference through lifestyle changes, as this visceral fat drives insulin resistance more significantly in women than in men.

High-fat diets (>46% calories from fat, <21% from carbs) do not improve exercise performance despite increasing fat oxidation.

Do not follow a high-fat, low-carb diet to improve performance. While it may help your body burn more fat, it does not make you faster and can actually hurt your performance, especially in intense or long events.

Self-reported dietary energy intake in population surveys is systematically biased by macronutrient composition, specifically under-reporting protein and over-reporting fat relative to actual expenditure.

When analyzing dietary data or tracking your own intake, do not assume that your macronutrient ratios are accurate if your total calorie count is off. People who under-report calories tend to under-report protein and over-report fat. This bias distorts the perceived relationship between diet and health outcomes, meaning 'healthy' diets may appear even healthier than they are in self-reported data.

Ultra-processed food (UPF) consumption in the UK has increased significantly over an 11-year period (2008-2018), while consumption of unprocessed/minimally processed foods has decreased, indicating a population-level shift toward processed diets.

Your diet has likely shifted towards more ultra-processed foods over the last decade, even if you don't feel it. To counter this, consciously increase your intake of unprocessed or minimally processed foods like fruits, vegetables, and whole grains, as these are declining in the general population.