Browse the evidence

Vitamin D deficiency (serum 25-OH D ≤15 ng/mL) is associated with a significantly increased risk of incident cardiovascular disease, with this association being particularly strong and statistically significant in individuals with hypertension.

If you have high blood pressure, getting your vitamin D levels checked is a prudent step. This study found that low levels (≤15 ng/mL) were linked to a significantly higher risk of heart events in hypertensive individuals. While fixing low levels doesn't guarantee prevention, it may be a valuable part of managing your overall cardiovascular risk, especially given the safety and low cost of supplementation.

Probiotics improve lipid profiles, reduce blood pressure, and lower glucose levels in patients with metabolic disorders (obesity, type 2 diabetes, insulin resistance).

If you have high cholesterol or blood sugar, adding specific probiotics to your diet may offer modest improvements in lipid profiles and glucose control. However, these effects are smaller than those of prescription drugs, so do not stop your medications without consulting your doctor.

Dietary modulation of the gut microbiota, specifically through the intake of prebiotics, probiotics, and polyphenols, can alter microbial composition and metabolic activity to confer health benefits, although human clinical efficacy remains ambiguous compared to animal models.

Focus on diverse plant-based foods (prebiotics) and fermented foods (polyphenols/probiotics) rather than relying on specific supplement brands. Human evidence for specific probiotic strains is mixed, so consistency in dietary fiber intake is likely more impactful than isolated supplements.

Breaking up prolonged sedentary time with short interruptions (breaks) improves metabolic health markers (waist circumference, triglycerides, glucose) independent of total sedentary time.

Set a timer to stand up and move for 1-2 minutes every 30-60 minutes while sitting. This 'breaking up' of sedentary time is associated with better metabolic health (lower triglycerides, glucose, waist circumference) than sitting continuously, even if your total sitting time remains high.

COVID-19 lockdown measures led to a significant increase in appetite and junk food consumption among younger demographics, resulting in a perceived weight gain in nearly half of the surveyed population.

During periods of high stress or isolation, be aware that your appetite may increase, particularly for junk food. This is a common reaction to boredom and stress, not a failure of willpower. Younger adults and those with higher BMI are more susceptible. To mitigate perceived weight gain, focus on managing stress and choosing healthier snacks rather than restricting food entirely.

Adherence to the Mediterranean Diet (MD) is inversely correlated with BMI and age, with younger adults (18-30) showing higher adherence and lower BMI compared to older and younger populations.

Young adults (18-30) tend to adhere better to the Mediterranean Diet and maintain lower BMIs. If you are older, you may need to put in more conscious effort to maintain this adherence. Focus on increasing fruits, vegetables, legumes, and fish while reducing red meat and sweets.

COVID-19 home confinement significantly reduces physical activity across all intensities (vigorous, moderate, walking) and increases daily sitting time, leading to a negative impact on physical fitness.

If you are under lockdown or confinement, expect your physical activity levels to drop and sitting time to rise significantly. To counteract this, you must proactively structure home-based exercise, as natural movement opportunities (commuting, gym access) are removed. Focus on maintaining daily movement rather than relying on previous routines.

COVID-19 home confinement leads to unhealthy dietary patterns, including increased consumption of unhealthy food, loss of control over eating, increased snacking, and a higher number of main meals per day.

During confinement, be aware that your eating habits may become less healthy due to stress and boredom. Monitor your intake of unhealthy foods, limit snacking between meals, and try to maintain a regular meal schedule. If you feel the urge to eat out of control, pause and identify if you are hungry or emotionally driven.

Short sleep duration is consistently associated with a significantly increased risk of obesity in both children and adults, with pooled odds ratios of 1.89 for children and 1.55 for adults.

Ensure you are getting sufficient sleep, as short sleep duration is linked to a higher risk of obesity. For adults, this often means aiming for more than 5-6 hours, and for children, more than 10 hours, though individual needs vary. While this study shows association, not causation, optimizing sleep is a low-risk, high-reward strategy for weight management.

In adults, each hour of reduced sleep is associated with a 0.35 unit increase in BMI, suggesting a dose-response relationship.

For adults, losing an hour of sleep per night is associated with a measurable increase in BMI (approx 0.35 units). Prioritizing adequate sleep duration may help maintain a healthy weight.

High levels of physical activity and energy expenditure, such as those derived from cycling as daily transport, act as a protective factor against obesity, although they may be counteracted by high energy-dense diets.

Incorporate daily movement, such as cycling or walking, into your routine to support weight management. However, recognize that exercise alone may not prevent weight gain if your diet consists of energy-dense foods; you must manage both your activity levels and your caloric intake.

High-intensity or intense aerobic exercise can cause transient hyperglycemia in individuals with Type 2 Diabetes, while moderate exercise generally lowers blood glucose.

Moderate aerobic exercise is generally recommended for lowering blood glucose. If you engage in brief, intense exercise, be aware that it may cause a temporary spike in blood glucose due to stress hormones. Monitor your levels if you are unsure how your body responds to high-intensity efforts.

Dietary interventions that minimize free radical reactions, specifically through caloric restriction and antioxidant supplementation, extend healthy life span and reduce age-related degenerative diseases.

To potentially extend your healthy life span, focus on maintaining a healthy body weight and consuming a diet rich in antioxidants (like Vitamin E, Vitamin C, and Selenium) while minimizing components that promote free radical damage, such as excessive polyunsaturated fats and copper. This approach aims to reduce the cumulative cellular damage associated with aging.

A high dietary fat intake is associated with oxidative stress and activation of proinflammatory transcription factors, whereas a diet rich in fruits and fiber has no inflammation-inducing capacity.

Reduce high-fat foods to lower inflammation. Focus on fruits and fiber, which do not trigger inflammatory responses even if calorie content is similar.

Regular monitoring of cardiovascular risk factors (weight, BMI, waist circumference, blood pressure, lipids, glucose) is recommended for all women with PCOS, regardless of age, due to increased prevalence of risk factors.

Get your blood pressure, cholesterol, and blood sugar checked regularly, even if you feel healthy. PCOS increases your risk for heart issues, so monitoring these numbers annually or as advised by your doctor is crucial for long-term health.

Testosterone replacement therapy increases muscle mass and strength in hypogonadal and elderly men, but its efficacy in elderly women is less clear and requires further research.

Testosterone therapy can help increase muscle mass and strength in men with low testosterone, but it is not a one-size-fits-all solution. Women should be cautious as the benefits are less clear. Always consult a doctor before considering hormone therapy.

Increasing vegetable and fruit consumption contributes to weight stability and may prevent body weight gain, but does not directly cause significant weight loss unless it replaces high-fat or high-energy foods.

To manage your weight, increase your vegetable and fruit intake to help you feel full with fewer calories. However, do not expect to lose weight just by adding them; you must also reduce high-fat or high-energy foods in your diet.

Magnesium supplementation is beneficial for treating specific clinical conditions including preeclampsia, migraine, depression, coronary artery disease, and asthma.

If you suffer from migraines, depression, or heart issues, ask your doctor about magnesium status. Standard blood tests might miss a deficiency because they only measure a tiny fraction of your body's total magnesium. Restoring adequate magnesium levels may help manage these conditions.

Insomnia is bidirectionally related to anxiety and depression, meaning insomnia predicts the onset of these mental health conditions and vice versa.

If you suffer from chronic insomnia, it is critical to screen for and treat anxiety or depression, as they likely fuel each other. Conversely, treating sleep problems may prevent the development of these mental health conditions. Do not treat sleep and mental health in isolation.

Short sleep duration is independently associated with increased risk of obesity and weight gain, particularly in children and younger adults.

Aim for 7-8 hours of sleep per night. This is not just about feeling rested; it is a critical weight management tool. Short sleep duration is linked to hormonal changes (lower leptin, higher ghrelin) that increase hunger and obesity risk, especially in younger individuals. Protecting sleep duration is as important as diet and exercise for maintaining a healthy weight.

The association between short sleep duration and obesity is stronger in children and adolescents than in adults, and may weaken with age.

Pay close attention to sleep duration, especially if you are a parent or young adult. Children and teens are particularly vulnerable to weight gain from short sleep. While the effect may diminish in older age, maintaining 7-8 hours of sleep is still a key component of metabolic health.

Weight loss reduces circulating levels of pro-inflammatory adipokines (leptin, TNF-α, IL-6) and improves endothelial function, thereby mitigating oxidative stress and cardiovascular risk.

Losing weight directly reduces the inflammatory burden on your body. This improves blood vessel health and reduces the risk of heart disease and diabetes. Focus on sustainable weight reduction to lower these biological risks.

Dietary patterns high in fat and carbohydrates exacerbate oxidative stress and inflammation in obese individuals, while antioxidant intake (e.g., fruit) may mitigate lipid peroxidation.

In obesity, both high-fat and high-carb diets can increase oxidative stress. Incorporating fruits and antioxidant-rich foods may help reduce this damage. Focus on reducing processed foods high in both fats and sugars.

Physical activity counseling and integrated care models improve adherence to exercise and reduce cardiovascular risk factors (blood pressure, BMI) in stroke survivors.

Use a structured counseling program with regular check-ins and accountability to maintain exercise habits. This approach has been shown to improve blood pressure, weight, and walking activity over the long term.