Browse the evidence

The metabolic response (specifically butyrate vs. propionate production) to dietary fiber supplementation is determined by the donor's baseline microbiota composition (Bacteroidaceae-Ruminococcaceae vs. Prevotellaceae-Ruminococcaceae dominance) rather than the specific type of fiber consumed.

Prebiotic fibers do not work in a vacuum; your existing gut bacteria dictate the health benefits you get. If your microbiome is dominated by Bacteroidaceae, fibers like inulin or beta-glucan will likely boost butyrate. If dominated by Prevotellaceae, they will likely boost propionate. There is no single 'best' fiber for everyone; the effect is personalized by your baseline microbiome.

Excessive dietary intake of carbohydrates, particularly fructose and sucrose, drives hepatic de novo lipogenesis through the activation of the transcription factor ChREBP, contributing to NAFLD progression.

If you have fatty liver, reducing sugar and refined carbohydrates (especially fructose from sodas and juices) can directly reduce the liver's production of new fat. This is because high carbohydrate intake activates specific genes (ChREBP) that turn sugar into fat in the liver, even if you aren't eating much dietary fat.

Circadian misalignment, such as night-shift work or irregular eating patterns, impairs hepatic metabolic function and increases the risk of developing NAFLD and insulin resistance.

Maintain a consistent sleep-wake cycle and try to align your eating window with your active hours. Disrupting your body's internal clock (e.g., through night shifts or late-night eating) can worsen insulin resistance and increase the risk of fatty liver, even if your diet is otherwise healthy.

Adherence to the DASH diet is inversely associated with all-cause, cardiovascular disease (CVD), stroke, and cancer mortality, with risk reduction increasing at higher adherence levels.

To lower your risk of dying from heart disease, stroke, or cancer, consistently follow the DASH diet principles. Focus on eating more whole grains, fruits, vegetables, nuts, and low-fat dairy, while cutting back on sodium, red meat, and sugar. Even modest adherence helps, but higher adherence (scoring above 20/40) provides even greater protection.

High fructose consumption, particularly from High-Fructose Corn Syrup (HFCS), promotes NAFLD by inducing gut microbiota dysbiosis, increasing intestinal permeability, and directly causing hepatic steatosis through de novo lipogenesis.

Limit intake of added sugars, especially HFCS. High fructose intake is directly linked to liver fat accumulation and gut barrier dysfunction.

Maximum mitochondrial capacity is directly related to muscle contractile performance and physical function in older adults, regardless of chronological age.

Improving your mitochondrial capacity through physical activity can directly improve your muscle strength and physical function. This means that exercises that boost mitochondrial health (like aerobic exercise) are not just good for your heart, but also for your ability to perform daily tasks and maintain muscle strength.

Mitochondrial efficiency (P/O ratio) is positively related to exercise efficiency (Gross and Net Efficiency) in older adults, and both are reduced by physical inactivity.

Your body's ability to convert oxygen into energy (mitochondrial efficiency) directly impacts how efficiently you move during exercise. Staying physically active helps maintain this efficiency, making your workouts feel easier and less taxing. This link highlights why consistent aerobic activity is beneficial for overall movement quality.

Synthesis of the mitochondrial phospholipid cardiolipin (CL) in brown and beige fat is essential for systemic energy homeostasis, insulin sensitivity, and metabolic flexibility.

Maintaining healthy brown and beige fat function appears crucial for metabolic health. This involves exposure to cold temperatures which naturally upregulates cardiolipin synthesis. While you cannot directly 'dose' cardiolipin, supporting thermogenic capacity through cold exposure may help maintain insulin sensitivity and metabolic flexibility, especially if you have reduced brown fat activity.

Personalized nutrition approaches should align with population-based recommendations for healthy individuals, with substantial divergence requiring significant scientific justification.

For healthy people, personalized nutrition should generally stay within standard healthy eating guidelines. If a program suggests a radical diet, it should provide strong scientific reasons for why it differs from standard advice.

Empagliflozin (10 mg/day) significantly reduces liver fibrosis (measured by liver stiffness measurement) in patients with Type 2 Diabetes and Non-Alcoholic Fatty Liver Disease compared to placebo, and reduces liver stiffness more effectively than pioglitazone.

If you have Type 2 Diabetes and fatty liver disease, ask your doctor about empagliflozin (10 mg daily). This study shows it can significantly reduce liver stiffness (a sign of scarring/fibrosis) better than the alternative drug pioglitazone, and better than a placebo. It also helps reduce body weight and visceral fat. Ensure you maintain moderate physical activity and follow dietary advice as part of your treatment.

High neighborhood fast-food outlet exposure is independently associated with higher BMI, body fat, and obesity odds, with a dose-response relationship observed across quartiles of exposure.

If you live in an area with many fast-food outlets, your risk of obesity is higher, even if you have a good income. This is likely because easy access makes unhealthy food the default choice. To counter this, be aware of your environment and plan your meals in advance to avoid relying on nearby fast-food options.

Low household income is independently associated with higher BMI, body fat, and obesity odds, with a dose-response relationship observed across income levels.

If you have a lower income, your risk of obesity is higher, even if you live in an area with few fast-food outlets. This is likely because budget constraints lead to cheaper, energy-dense food choices. To counter this, prioritize affordable, nutrient-dense foods like beans, lentils, and seasonal vegetables.

The combination of lowest household income and highest fast-food outlet exposure results in a 'double burden' with greater odds of obesity and frequent processed meat consumption than either factor alone, demonstrating additive interaction.

If you have a low income and live in an area with many fast-food outlets, your risk of obesity is significantly higher than if you only had one of these risk factors. This is because budget constraints and easy access to unhealthy food interact to make healthy eating very difficult. To counter this, focus on strategies that address both cost and access, such as meal planning and seeking out affordable, healthy food options.

Subjective feelings of loneliness are robustly associated with poorer sleep quality (specifically subjective quality and daytime dysfunction) in young adults, independent of social isolation, psychopathology, and genetic/family confounds.

If you are feeling lonely, expect your sleep quality to suffer, specifically how rested you feel and your daytime energy, even if you get enough hours in bed. This is not just 'in your head' but a documented physiological response involving threat vigilance. Addressing the underlying social connection or cognitive perception of isolation may be more effective for sleep than standard sleep hygiene alone.

Adherence to a Mediterranean Diet (MD) reduces the incidence of NAFLD and improves insulin resistance through antioxidant, anti-inflammatory, and lipid-lowering mechanisms.

Adopt a Mediterranean Diet rich in vegetables, fruits, whole grains, olive oil, and fish. This specific dietary pattern has been shown to lower the risk of developing fatty liver and improve insulin sensitivity.

Resistance exercise preferentially increases circulating lactate and purine metabolites (inosine, hypoxanthine, xanthine) compared to endurance exercise, suggesting a higher demand for glycolytic ATP turnover and nucleotide degradation during anaerobic efforts.

Resistance training creates a unique metabolic environment with high lactate and purine breakdown. This signals your body to adapt to high-intensity demands. Embrace the burn as a sign of effective glycolytic training, not just fatigue.

Meat and meat products are the primary source of total protein (39.0%), branched-chain amino acids (BCAAs: leucine 39.9%, isoleucine 41.3%, valine 37.4%), and most essential amino acids (lysine 49.2%, histidine 46.6%, threonine 44.7%, tryptophan 41.4%, methionine 44.2%) in the average Polish diet, while grain products are the dominant source for specific non-essential amino acids like cysteine (41.7%), glutamic acid (33.8%), and proline (34.1%).

To ensure adequate intake of essential amino acids, particularly BCAAs and lysine, include meat, poultry, or fish in your diet. If you reduce meat consumption, prioritize grains (for cysteine, glutamic acid, proline) and dairy or legumes to fill the gaps. A combination of these three food groups (meat, grains, dairy) typically covers over 80% of your amino acid requirements.

Weight loss of 7-10% is required to resolve NAFLD, but achieving this through lifestyle changes alone is difficult as only 10-20% of individuals succeed, and weight loss is less effective for NASH resolution in diabetic patients.

To resolve fatty liver disease, you need to lose 7-10% of your body weight. This is a high bar, and most people struggle to reach it with diet and exercise alone. If you have diabetes, this is even harder. Because lifestyle changes alone often fail to hit this target, you should discuss pharmacological options (like GLP-1 agonists) with your doctor to help you reach this weight loss goal.

GLP-1 receptor agonists and SGLT2 inhibitors show promising benefits for NAFLD/NASH patients, particularly by addressing underlying metabolic dysfunction, though specific histological resolution data is still emerging.

If lifestyle changes aren't enough to manage your fatty liver, ask your doctor about GLP-1 agonists (like semaglutide) or SGLT2 inhibitors (like empagliflozin). These diabetes/obesity drugs have shown promise in improving liver health by targeting the underlying metabolic issues.

Lean individuals can develop NAFLD due to visceral adiposity and insulin resistance, and this condition carries similar risks of fibrosis and NASH as obesity-related NAFLD.

Even if you are lean, you can still have fatty liver disease, especially if you are of Asian descent. This is often due to hidden visceral fat. Because lean NAFLD can still lead to serious liver damage (NASH and fibrosis), you should get screened if you have risk factors like family history or metabolic issues, regardless of your weight.

Assessment of metabolic risk factors is critical in patients with NAFLD because advanced liver fibrosis correlates with metabolic comorbidities, and early identification of these factors prevents cardiovascular and liver-related mortality.

If you have NAFLD, focus on managing your metabolic health (blood sugar, blood pressure, weight) even if your liver enzymes look normal. This is the most effective way to protect your heart and liver from serious damage.

Vitamin D deficiency is highly prevalent in athletes across various sports and ethnicities, often leading to musculoskeletal issues like stress fractures and muscle weakness.

Don't assume your fitness protects you from Vitamin D deficiency. It is very common in athletes, especially those who train indoors or have darker skin. Get tested to avoid stress fractures and muscle weakness.

Longitudinal sleep trajectories characterized by consistently short sleep (<5 hours) or decreasing sleep duration are associated with significantly increased risks of cardiovascular events and all-cause mortality compared to stable normal sleep (7-8 hours).

Monitor your sleep duration over time, not just on a single night. If you consistently sleep less than 5 hours a night, or if your sleep duration is steadily decreasing over months or years, you are at a significantly higher risk for heart disease and early death. Aim for a stable 7-8 hours of sleep. If you are experiencing a decline in sleep, investigate underlying causes (stress, health issues) and seek medical advice, as this pattern is a strong predictor of adverse health outcomes.

The deleterious effects of total sitting time on HDL cholesterol, triglycerides, and post-load glucose become significantly more severe as the duration of uninterrupted sitting bouts increases.

Be aware that sitting for long periods (e.g., >30 mins) is worse for your cholesterol and blood sugar than sitting for the same total time in shorter chunks. If you have a long meeting or drive, try to break it up if possible to mitigate the metabolic impact.