Browse the evidence

Chronic psychological or physiological stress contributes to severe disease susceptibility by increasing cortisol, which suppresses immune function (specifically secretory IgA) and promotes dysbiosis, thereby increasing vulnerability to infection.

Manage chronic stress through mind-body interventions like diaphragmatic breathing or other relaxation techniques, as high stress levels can suppress your immune system and disrupt your gut health, making you more vulnerable to infections.

Long-term adherence to low-carbohydrate diets may attenuate weight loss benefits and potentially increase LDL cholesterol in some individuals, raising cardiovascular risk concerns.

While LCDs work well for short-term weight loss, be aware that benefits may diminish after a year, and some people see their bad cholesterol (LDL) rise. Regular monitoring of lipids and liver health is essential if you stay on this diet long-term.

The weight loss benefit of tirzepatide over semaglutide is significantly attenuated or absent in patients with type 2 diabetes compared to those without diabetes.

For patients with diabetes, the weight loss advantage of tirzepatide over semaglutide seen in non-diabetics may not be present. Consult your doctor to manage expectations regarding weight loss if you have diabetes.

Fasting plasma ghrelin concentrations are significantly decreased in human obesity compared to lean individuals, contradicting the hypothesis that elevated ghrelin drives obesity.

This research suggests that simply having high ghrelin is not the driver of obesity; in fact, obese individuals often have lower levels. This challenges the idea that 'fixing' ghrelin by increasing it would help, as the body may have downregulated it in response to excess energy. Future weight loss strategies may need to address why ghrelin remains suppressed or how to normalize its regulation, rather than just suppressing it further.

High-level mercury exposure (occupational/accidental) causes neurotoxicity, but low-level exposure from typical fish consumption has unclear or modestly decreased cardiovascular benefits in adults, without clear adverse effects.

For most adults, the cardiovascular benefits of eating fish outweigh any potential negative effects of low-level mercury. However, those who eat very high amounts of fish (>5 servings/week) should be mindful of mercury levels in their chosen species.

Intra-uterine levonorgestrel administration provides long-term symptom relief for symptomatic endometriosis, with pain and blood loss decreasing significantly over 3 years, though device retention rates drop over time due to irregular bleeding.

For symptomatic endometriosis, a Levonorgestrel IUD can significantly reduce pain and blood loss over 3 years. Be prepared for irregular bleeding in the first 6 months, which is the main reason women remove the device, but the long-term symptom relief is substantial.

Emerging adults are heavily targeted by food and beverage marketing, which contributes to increased consumption of fast food and soft drinks, thereby driving weight gain.

Recognize that fast food and soda companies spend billions targeting your age group. Be skeptical of 'value' deals and late-night marketing. Opt for healthier alternatives when possible, as these products are engineered to be highly appealing and accessible.

Postmenopausal estrogen therapy is associated with a reduced risk of coronary heart disease in prospective observational studies.

If you are postmenopausal, this study suggests that estrogen therapy might lower your risk of heart disease. However, this is an observational study, so other factors might be involved. Consult your doctor to weigh the benefits against potential risks like breast cancer or blood clots, as individual health profiles vary significantly.

Obese individuals possess a gut microbiota composition (higher Firmicutes/Bacteroidetes ratio) that extracts more calories from indigestible dietary polysaccharides than lean microbiota, contributing to positive energy balance.

Your gut bacteria may be more efficient at extracting calories from fiber and complex carbs than a lean person's. This isn't an excuse, but a factor to consider. Focus on whole foods that support a diverse microbiome, as weight loss itself has been shown to shift this ratio back toward a leaner profile.

Replacing saturated fats with omega-6 linoleic acid (LA) from safflower oil increases all-cause, cardiovascular, and coronary heart disease mortality in men with established coronary heart disease.

If you have established heart disease, replacing saturated fats with high-linoleic acid oils (like safflower oil) may increase your risk of death rather than decrease it. Current guidelines recommend this substitution, but this study suggests it might be harmful for this specific population. Consider discussing the specific type of fat (LA vs. n-3) with your cardiologist.

The cardiovascular risk associated with high linoleic acid intake is significantly modified by oxidative stress factors, specifically smoking and alcohol consumption.

If you smoke or drink heavily, consuming high amounts of linoleic acid (from safflower oil) may be particularly dangerous for your heart. The risk is less clear if you do not smoke or drink. This suggests that lifestyle factors interact with fat intake.

The efficacy of low carbohydrate diets for diabetes remission is markedly reduced in patients who are using insulin.

If you are using insulin for type 2 diabetes, a low carbohydrate diet can still help, but the chances of achieving full remission are lower than for those not using insulin. You may need to work more closely with your healthcare provider to adjust your insulin dosage as your blood sugar improves.

Bariatric surgery, particularly Roux-en-Y gastric bypass and vertical sleeve gastrectomy, is associated with an increased risk of substance misuse disorders, suicide, and nutritional deficiencies.

Patients must be aware that bariatric surgery increases the risk of alcohol misuse, suicide, and nutritional deficiencies. Roux-en-Y gastric bypass and vertical sleeve gastrectomy alter alcohol absorption, increasing misuse risk. Lifelong supplementation and monitoring for mental health and nutritional status are essential.

A glucose disposal rate (GDR) below 5.3 mg/kgFFM+17.7 min during an 80 mU/m2·min hyperinsulinemic-euglycemic clamp identifies insulin resistance with 83% sensitivity and 96% specificity.

If your metabolic test uses a lower insulin dose (80 mU/m2·min), a glucose disposal rate below 4.1 mg/kg fat-free mass per minute is a strong indicator of insulin resistance, with very high specificity.

Altered glucose and insulin homeostasis in older adults, including elevated postprandial glucose and insulin, delays the return of hunger and contributes to reduced energy intake.

Focus on meals with a lower glycemic impact to avoid prolonged post-meal fullness and delayed hunger, which can suppress subsequent intake in older adults.

Abstinence from alcohol (no drinks per day) is associated with a higher risk of metabolic syndrome compared to moderate consumption (one to three drinks per day).

If you do not drink alcohol, you are not at higher risk for metabolic syndrome than moderate drinkers. The study's finding that moderate drinkers had lower risk than abstainers is observational and does not imply that non-drinkers should start drinking. Focus on maintaining a healthy weight and being physically active.

Mechanical load is sensed by specific proteins including filamin-C, BAG3, titin, and costameres (integrins, FAK), which transduce force into hypertrophic signaling via mTORC1 and Hippo pathway activation.

This node describes the internal biological machinery of muscle growth. For the average exerciser, understanding that specific proteins sense force reinforces the importance of progressive overload and mechanical tension. While you cannot directly control these proteins, ensuring your training provides adequate mechanical stress (via load and volume) is the way to engage these sensors.

Short-chain fatty acids (SCFA) produced by gut microbiota from flavonoid and fiber fermentation influence energy metabolism, glucose-insulin homeostasis, and inflammatory pathways, with effects mediated by G-protein-coupled receptors (GPR).

Support your gut microbiota with fiber and flavonoid-rich foods to promote the production of short-chain fatty acids (SCFA). These byproducts help regulate blood sugar, energy expenditure, and inflammation.

High-protein diets may be detrimental to glucose control and insulin sensitivity in individuals with diabetes mellitus.

If you have diabetes, be cautious with high-protein diets. They may worsen your blood sugar control and insulin sensitivity. Consult your doctor before significantly increasing protein intake.

Energy restriction inhibits neoplastic progression in animal models, though disentangling the effects of energy restriction from reduced adiposity remains difficult.

While animal studies show energy restriction reduces tumor growth, it is unclear if this is due to the restriction itself or the resulting weight loss. Human studies are needed to clarify this.

In overweight or obese patients with cardiovascular risk factors, naltrexone-bupropion treatment does not increase the risk of major adverse cardiovascular events (MACE) compared to placebo, although noninferiority was not formally proven due to early trial termination.

For patients with obesity and heart risk factors, naltrexone-bupropion does not appear to increase the risk of heart attacks or strokes compared to placebo, based on interim data. However, the study was stopped early, so doctors cannot yet definitively say it is safe for all purposes. It requires careful monitoring and is part of a broader weight management program.

Caloric restriction extends lifespan and delays age-related cardiovascular disease by attenuating oxidative stress and activating the Nrf2/antioxidant response element pathway.

To potentially leverage the anti-aging mechanisms described, consider reducing overall caloric intake without malnutrition. This may activate protective pathways like Nrf2 and SIRT1, improving vascular health and reducing oxidative stress. Consult a healthcare provider before making significant dietary changes, especially if you have underlying health conditions.

Adolescent consumption of sugar-sweetened beverages (SSBs) is associated with an increased risk of early-onset colorectal cancer (EO-CRC) later in life.

For parents and adolescents, reducing SSB consumption during teenage years may help lower the risk of early-onset colorectal cancer in adulthood. Encouraging healthier beverage alternatives like water, milk, or coffee can be beneficial.

Nutritional support alone is ineffective for treating disease-induced cachexia because the primary driver is cytokine-mediated muscle catabolism and hypothalamic dysregulation, not simple energy deficit.

If a patient has cachexia (wasting due to illness like cancer or sepsis), simply increasing food intake will not restore muscle mass. Treatment requires addressing the underlying disease (e.g., infection, cancer) and potentially exercise, as nutrition alone is insufficient.