Browse the evidence

Immigrants experience a deterioration in nutritional health and increased risk of chronic conditions (obesity, diabetes, hypertension) as duration of stay in the host country increases, a phenomenon termed the loss of the Healthy Immigrant Effect.

For immigrants, health risks increase the longer you stay in a new country due to dietary shifts. To counter this, actively maintain traditional healthy foods while learning to navigate the new food environment. Focus on accessing traditional ingredients and understanding how to adapt them to local nutritional standards to prevent the 'acculturation penalty' on health.

Maintaining traditional ethnic diets can offer protective nutritional benefits (e.g., higher fruit/vegetable intake, plant-based proteins) but may also introduce risks (e.g., high sodium, saturated fats) if traditional foods are substituted with processed versions available in the host country.

Don't assume all traditional foods are healthy. Check the sodium and fat content of your ethnic staples. If you can't find authentic ingredients, try to recreate dishes from scratch using whole foods rather than relying on processed ethnic products which may be high in sodium and fat.

Socioeconomic status (SES), food insecurity, and lack of social support are significant drivers of unhealthy dietary transitions and health deterioration in immigrants, often overriding cultural preferences.

If you are struggling financially, prioritize affordable, nutrient-dense foods that fit your culture. Use community resources, ethnic markets, and food banks to access traditional ingredients. Don't feel guilty about choosing cheaper options; focus on making the best choices within your budget.

Sarcopenic obesity, defined as the coexistence of low muscle mass/strength and high adiposity, significantly increases the risk of all-cause mortality, cardiovascular disease, and frailty compared to having either condition alone.

If you are older or have obesity, do not rely on BMI alone. Muscle loss combined with fat gain is a specific, high-risk condition that increases mortality and heart disease risk. Focus on maintaining muscle mass through resistance exercise and adequate protein intake, rather than just weight loss, which can worsen muscle loss if not managed carefully.

Sarcopenic obesity drives cardiovascular disease and mortality through mechanisms of chronic low-grade inflammation, insulin resistance, and lipotoxicity, creating a vicious cycle with cardiovascular conditions.

Understanding that fat and muscle loss interact to cause inflammation and heart risk highlights why treating both is crucial. Managing inflammation and insulin sensitivity through lifestyle can break this cycle.

There is no minimal threshold for cognitive benefit from exercise; any amount of physical activity is better than none, though clinically meaningful changes require ~724 METs-min/week.

You do not need to exercise for hours to see brain benefits. Even small amounts of activity help. However, to see significant, clinically meaningful improvements, aim for approximately 724 METs-min per week (e.g., 150 minutes of moderate activity).

Obesity moderates the dose-response relationship for cognitive benefits, with overweight/obese older adults reaching maximal cognitive benefits at lower exercise doses (~600 METs-min/week) than those with healthy BMI.

If you are overweight or obese, you may achieve maximum cognitive benefits with around 600 METs-min of exercise per week. Pushing beyond this may not yield additional cognitive gains and could be unrealistic. Start with moderate doses.

Long-term persistent leisure-time physical activity is associated with a serum metabolome profile indicating reduced cardiometabolic disease risk, including lower levels of isoleucine, alpha1-acid glycoprotein, glucose, and very-low-density lipoprotein, and higher levels of large/high-density lipoprotein particles.

Maintaining a consistent level of leisure-time physical activity over many years is associated with a healthier metabolic profile, including better lipid management and lower markers of inflammation and diabetes risk. Focus on consistency rather than intensity; even moderate activity sustained over decades yields significant metabolic benefits compared to inactivity.

Fat Mass Index (FMI) is a superior screening tool for predicting metabolic syndrome compared to Body Mass Index (BMI) and Percentage of Body Fat (BF%), providing higher predictive accuracy and independent risk association.

If you are screening for metabolic syndrome, do not rely solely on BMI. Use Fat Mass Index (FMI), calculated as fat mass divided by height squared. For men, an FMI cutoff of 7.00 kg/m2 and for women, 7.90 kg/m2 are optimal thresholds for predicting metabolic syndrome. This is more accurate than BMI or simple body fat percentage.

Obese individuals exhibit heightened incentive motivation (desire/willingness to work for food) and physiological responsiveness to food cues compared to lean individuals, despite not necessarily reporting higher hedonic liking (pleasure).

Focus less on whether you 'like' the food more than others, and more on how your environment triggers your desire to eat. Obese individuals often show higher 'incentive salience' (willingness to work for food) when exposed to cues. Managing the visibility and availability of food cues may be more effective than relying on willpower or taste preferences alone.

Daily intake of Lactobacillus reuteri (2x10^10 cells) for 4 weeks increases glucose-stimulated GLP-1 and GLP-2 secretion, which in turn increases insulin and C-peptide secretion in glucose-tolerant humans.

Taking Lactobacillus reuteri (20 billion cells twice daily) for a month can boost your body's production of GLP-1 and GLP-2 hormones after meals, which helps your pancreas release more insulin. However, this does not make your body more sensitive to insulin or help you lose weight if you are already healthy. It is a specific hormonal boost, not a general metabolic fix.

Ethinyl estradiol is strongly associated with an increased risk of cardiovascular events and should be avoided in transgender women; oral and transdermal estradiol are preferred.

Transgender women should avoid ethinyl estradiol due to its strong association with blood clots and cardiovascular events. Instead, use oral or transdermal estradiol, which are safer and preferred formulations.

Leptin repletion following weight loss (maintenance phase) reverses metabolic adaptations (hypometabolism, hyperphagia) and aids in sustaining weight loss, but does not significantly lower the body weight set-point.

After losing weight, your body fights back with increased hunger and slower metabolism. Leptin therapy can help reverse these specific biological drivers during the maintenance phase, making it easier to keep the weight off, though it is not a weight-loss drug itself.

Obesity causes a significant reduction in circulating adiponectin levels, which contributes to insulin resistance, metabolic syndrome, and increased cancer risk.

If you have excess body fat, your body naturally produces less of this protective hormone, which makes you more resistant to insulin and prone to inflammation. This is a biological feedback loop, not a character flaw. Addressing the underlying adiposity through sustainable lifestyle changes can help restore normal adiponectin levels and improve metabolic health.

Physical inactivity and high fat diet interact to promote obesity, particularly in genetically susceptible individuals, by limiting fat oxidation capacity.

If you have a family history of obesity, avoid being sedentary and limit dietary fat to 20-25% of energy. This combination helps overcome genetic tendencies for low fat oxidation and prevents weight gain.

Dietary intake of monounsaturated fatty acids (MUFAs), particularly from extra virgin olive oil, increases the Bacteroidetes/Firmicutes ratio and reduces obesity, insulin resistance, and inflammatory bowel disease in animal and human models.

Incorporate monounsaturated fats, especially from extra virgin olive oil, into your diet. This is linked to a healthier gut microbiome, reduced obesity, and lower risk of insulin resistance and inflammation in both animal and human studies.

Dietary intake of n-3 polyunsaturated fatty acids (PUFAs), such as EPA and DHA from fish oil, increases the Bacteroidetes/Firmicutes ratio and reduces obesity, insulin resistance, and inflammatory bowel disease, whereas n-6 PUFAs (like linoleic acid) may have the opposite effect.

Increase your intake of n-3 polyunsaturated fatty acids (found in fish oil, flaxseed, and canola oil) and balance your n-6 to n-3 ratio. This is linked to a healthier gut microbiome, reduced obesity, and lower risk of insulin resistance and inflammation in both animal and human studies. Limit excessive n-6 PUFA intake (found in corn and soybean oils).

High DHA fish oil supplementation (DHA > EPA) improves cardiovascular efficiency during submaximal exercise by lowering heart rate and improving heart rate variability, without negatively affecting endurance performance.

If you are looking to improve cardiovascular efficiency during moderate exercise, high DHA fish oil (where DHA exceeds EPA) may help lower your heart rate for a given workload. This does not necessarily make you faster (endurance performance was unaffected in some studies), but it may make exercise feel easier by reducing cardiac strain. Look for supplements with a DHA:EPA ratio greater than 1:1, dosed between 1-6g daily.

High DHA fish oil supplementation improves postprandial arterial stiffness and endothelial function, potentially reducing cardiovascular disease risk, whereas EPA alone may not provide the same postprandial benefit.

To support vascular health and reduce arterial stiffness after meals, choose a high DHA fish oil supplement (where DHA is higher than EPA). This may improve how your arteries handle the stress of a fatty meal. Standard fish oils with higher EPA may not offer this specific post-meal vascular benefit.

Applying blood flow restriction (BFR) during low-intensity resistance exercise (20% 1RM) significantly increases intramuscular metabolic stress (PCr depletion, pH decrease) and fast-twitch fiber recruitment compared to low-intensity exercise without BFR, but does not reach the metabolic stress levels of high-intensity exercise (65% 1RM).

If you use blood flow restriction with light weights (20% 1RM), you will get more metabolic stress and some fast-twitch fiber recruitment than with light weights alone. However, this stress is still lower than what you get from heavier weights (65% 1RM). Do not assume BFR makes light weights equivalent to heavy weights; it is an adjunct, not a full replacement, for high-intensity training.

A comprehensive population-wide lifestyle intervention program, including mass media campaigns, fiscal measures, and health education, can successfully reduce cardiovascular risk factors such as hypertension, smoking, and alcohol consumption in a developing country.

Community-wide efforts, such as public education campaigns and policy changes (e.g., taxes on tobacco/alcohol), can effectively reduce smoking, alcohol misuse, and hypertension rates. Individuals can benefit from these broader societal shifts.

Impaired nighttime sleep (increased wake time) in healthy older adults is associated with elevated 24-hour plasma levels of Interleukin-6 (IL-6) and cortisol, with the association being significantly stronger in older adults than in young adults.

If you are an older adult experiencing fragmented sleep, your body may be producing higher levels of stress hormones (cortisol) and inflammatory markers (IL-6) during the day, which in turn worsen your sleep. This creates a cycle. Managing stress and inflammation may help break this cycle, rather than accepting poor sleep as an unavoidable consequence of aging.

Higher overall diet quality, particularly adherence to Mediterranean-style dietary patterns, is associated with a lower risk of declines in physical performance (walking speed, mobility) in older adults.

For older adults, prioritizing overall diet quality—specifically patterns like the Mediterranean diet rich in vegetables, fruits, whole grains, fish, and olive oil—is strongly linked to maintaining physical mobility and walking speed. While the link to muscle mass is less clear, improving diet quality is a key strategy for preserving physical function and reducing the risk of mobility disability.

Consuming 1 cup (150g) of blueberries daily for 6 months improves endothelial function and reduces arterial stiffness in adults with metabolic syndrome, independent of changes in insulin resistance.

If you have metabolic syndrome, eating one cup of blueberries every day for six months can improve your blood vessel health and stiffness, which lowers cardiovascular risk. However, this amount of blueberries will not improve your insulin resistance or blood sugar control, so it should be part of a broader strategy that includes managing insulin sensitivity.