Browse the evidence

Transitioning from obesity to non-obesity, transitioning from non-obesity to obesity, or maintaining stable obesity is associated with an elevated risk of chronic kidney disease (CKD) compared to maintaining stable non-obesity.

Maintaining a stable, non-obese weight is the most protective strategy for kidney health. Both gaining weight (if you are not obese) and losing weight (if you are obese) carry higher risks than staying stable. If you are obese, aim for gradual, sustainable weight management rather than rapid loss, as rapid loss may harm kidney function. Avoid weight cycling.

Extreme weight gain (≥20 kg) and substantial weight loss (>2.5 kg) are associated with increased CKD risk, forming a J-shaped or U-shaped relationship.

Avoid both extreme weight gain and substantial weight loss. Even small gains (≥2.5 kg) can increase kidney risk, especially in young adulthood. If you are obese, avoid rapid or substantial weight loss as it may also harm kidney function. Focus on stability.

The association between weight change patterns and CKD risk is stronger in individuals under 60 years of age at baseline compared to those 60 years or older.

If you are under 60, pay close attention to your weight stability. The risk to your kidneys from weight fluctuations is higher for you than for older adults. Prioritize maintaining a stable, healthy weight.

The mortality benefits of healthful plant-based diets are more pronounced in younger adults (<65 years) and men, while the risks of unhealthful plant-based diets are significantly stronger in individuals with obesity (BMI ≥ 25 kg/m²).

If you are under 65 or have obesity, paying close attention to the quality of your plant foods (choosing whole grains over refined ones) may offer you particularly strong protection against mortality. For older adults or those with normal BMI, the benefits still exist but may be less pronounced.

The primary sources of ultra-processed food energy intake vary by age group, with alcohol and grain-based products being major contributors across all groups, while legumes, milk, and dairy products become more significant contributors as UPF consumption increases and age rises.

Identify the specific ultra-processed foods that make up the bulk of your UPF intake. For many Koreans, this includes alcohol and grain-based products. For older adults, UPFs from legumes, milk, and dairy may also be significant contributors. Targeting these specific categories for reduction or substitution may be more effective than a blanket 'no UPF' rule.

Biomechanical factors such as muscle length and joint angles during compound exercises can lead to suboptimal activation of specific muscles, necessitating targeted isolation exercises to address these gaps.

Understand that squats and deadlifts don't work every muscle equally. For example, squats don't fully stretch or activate the rectus femoris or hamstrings. Add leg extensions and leg curls to your routine to ensure these muscles get adequate stimulus for growth.

The specific repetition scheme used in Low-Load Resistance Training with Blood Flow Restriction (LL-RT with BFR) does not significantly affect muscle hypertrophy outcomes when compared to High-Load Resistance Training.

You can choose your preferred repetition scheme for BFR training (whether to failure, 15 reps, or 75 reps) without worrying about which is 'best' for muscle growth. Focus on consistency and comfort.

Using external momentum (cheat repetitions) during single-joint upper body resistance training produces muscle hypertrophy equivalent to strict form, despite significantly higher total volume load.

If you are doing single-joint exercises like bicep curls or tricep pushdowns, using controlled momentum (cheat reps) to get more reps or heavier loads will likely build muscle just as well as strict form. You don't need to fear cheat reps for hypertrophy purposes, but be aware that the extra stress goes to other muscles (like shoulders or back) and may increase injury risk over time. Use them strategically to increase volume, but prioritize strict form for joint health if you are prone to injury.

Varying proximity-to-failure (progressively decreasing RIR from 4 to 1) does not enhance short-term muscle strength or hypertrophy compared to consistently training at 1 RIR in resistance-trained individuals.

If you are an experienced lifter, you do not need to vary your proximity to failure week-to-week to get stronger or bigger. Training consistently at 1 Repetition in Reserve (RIR 1) produces the same results as a program that starts easy (RIR 4) and gets harder (RIR 1). However, the varying approach results in lower perceived exertion (RPE) during the easier weeks, which may make the training feel less stressful without sacrificing gains.

Consumption of an ultra-processed dietary pattern (80% UPFs) induces significant alterations in plasma and urine metabolomic profiles compared to an unprocessed dietary pattern, affecting pathways such as glutamate, bile acid, and fatty acid metabolism.

Even if you match the protein and carbs, eating ultra-processed foods changes your body's internal chemistry differently than whole foods. Look for changes in metabolites related to bile acids and amino acids, which may signal different metabolic stressors.

Adopting a low-inflammatory dietary pattern during a behavioral weight loss intervention significantly improves psychological health outcomes, including reduced depression and stress, independent of the amount of weight lost.

If you are trying to lose weight, pay attention to how inflammatory your diet is, not just how many calories you cut. Choosing foods that reduce inflammation (like vegetables, fruits, and healthy fats) can significantly lower your stress and depression levels and improve your overall quality of life, even if the scale doesn't move as fast as you'd like. This mental health benefit is distinct from the physical act of losing weight itself.

Dietary fiber intake must be accompanied by adequate water intake to prevent constipation, a common adverse event of anti-obesity medications.

When taking weight loss medications, increase your intake of fruits, vegetables, and whole grains for fiber, but you MUST drink more water. Without enough fluid, high fiber can cause constipation, which is already a common side effect of these drugs.

In patients with heart failure and reduced ejection fraction (HFrEF), a BMI greater than 27 kg/m² is associated with significantly higher risks of cardiovascular mortality, heart failure hospitalization, and composite adverse outcomes compared to a BMI of 24–27 kg/m².

If you have heart failure with reduced ejection fraction, maintaining a BMI between 24 and 27 kg/m² is associated with better survival and fewer hospitalizations than having a BMI over 27. This is especially true if your heart failure is caused by coronary artery disease (ischemic). You should discuss weight management strategies with your cardiologist, as higher BMI may increase your risk of cardiovascular death and hospitalization.

Incretin-based therapies (GLP-1RA and dual agonists) cause a mild absolute decrease in skeletal muscle mass and strength, but this is offset by a disproportionately larger loss of fat and liver mass, resulting in improved relative muscle-to-body-weight ratios and preserved or enhanced physical function.

If you are using incretin-based medications for weight loss, expect some loss of absolute muscle mass, but do not panic about 'wasting.' The medication preferentially burns fat and liver fat, which improves your muscle-to-weight ratio. Your strength and endurance often improve because you are carrying less weight. To maximize muscle retention, prioritize resistance training and adequate protein intake, as the drug itself does not protect muscle mass but does not disproportionately destroy it either.

Tirzepatide treatment yields greater improvements in physical function for patients with lower baseline physical function scores compared to those with higher baseline scores, despite similar magnitude of weight loss across all baseline levels.

If you have obesity and struggle with physical function (e.g., difficulty walking, climbing stairs), starting tirzepatide is highly recommended. You will likely lose weight just as effectively as someone who is more active, and you may experience the most dramatic improvements in your daily physical capabilities. Do not let current mobility issues stop you from seeking treatment.

Dietary interventions alone are insufficient for long-term obesity management due to biological resistance mechanisms that promote weight regain, necessitating a multi-modal approach including physical activity, behavioral therapy, pharmacotherapy, or surgery.

Stop looking for a single 'magic' diet that cures obesity. Sustainable weight management requires a combination of safe nutrition, regular physical activity, and behavioral support. If lifestyle changes are insufficient, consult a doctor about pharmacotherapy or surgery. Focus on long-term health improvements (blood pressure, glucose) rather than just the number on the scale, and be aware that biological mechanisms will fight weight loss, so ongoing maintenance strategies are essential.

In individuals with obesity and multiple long-term conditions (MLTCs), BMI reductions of ≥7% are associated with a lower risk of developing new obesity-related complications (ORCs) and reduced polypharmacy compared to stable BMI, whereas both significant weight loss and weight gain are associated with increased hazards for mental-health conditions, hospitalization, and mortality.

For people with obesity and multiple chronic conditions, losing weight (≥7%) can help prevent new diseases and reduce the number of medications. However, this population also faces higher risks of mental health issues, hospitalization, and mortality with both weight loss and gain compared to maintaining a stable weight. Treatment should be personalized, focusing on overall health outcomes rather than weight change alone.

Bariatric surgery remains the most efficacious treatment for obesity, producing sustained weight loss of approximately 20% or higher and superior metabolic improvements compared to pharmacotherapy alone.

If you have severe obesity, bariatric surgery is currently the most effective medical intervention for achieving significant, sustained weight loss and reversing metabolic diseases like type 2 diabetes. While it is invasive, it is considered safe and offers better long-term outcomes than medication alone for many patients.

Combining CPAP therapy with weight loss (via pharmacotherapy or lifestyle) yields greater improvements in cardiovascular risk markers than treating either condition alone.

If you have sleep apnea and are overweight, don't just focus on one. Using CPAP while also working to lose weight (through diet, exercise, or medication) provides the best protection for your heart and blood pressure. Treating just one condition leaves you at higher risk.

Supplementing with whey protein hydrolysate before and whey protein plus carbohydrate after endurance training sessions significantly increases specific mitochondrial protein content (Cytochrome C) compared to isocaloric carbohydrate alone, without improving VO2max or time trial performance.

If you are a trained runner, taking whey protein before and protein+carbs after your runs will increase specific mitochondrial proteins (like Cytochrome C) compared to just taking carbs. However, this biochemical change did not result in faster race times or higher VO2max over 6 weeks. You might take it for potential recovery or long-term mitochondrial health, but do not expect it to make you faster than if you just took carbohydrates.

Supplementing endurance training with whey protein hydrolysate before and whey protein plus carbohydrate after exercise significantly increases mitochondrial protein content (specifically Cytochrome C) compared to isocaloric carbohydrate-only supplementation, without altering VO2max or performance.

If you are a trained runner, adding whey protein hydrolysate before and after your runs (0.3g/kg) along with carbs after (1g/kg) may help your muscles build more mitochondrial proteins compared to just drinking carbs. However, do not expect this to make you run faster or improve your VO2max any more than drinking carbs alone would. It is a recovery tool, not a performance enhancer.

Knee extension strength is a more valid and predictive measure of functional performance and health characteristics in older adults than handgrip strength.

If you are assessing muscle strength for health monitoring, prioritize knee extension strength over handgrip, as it better predicts your functional ability and health status.

Ingesting 4.5g of Alaska Pollack Protein (APP) daily for 3 months improves neuromuscular efficiency (neural economy) in young healthy adults, evidenced by a greater reduction in motor unit discharge rates compared to whey protein, without increasing muscle mass.

If you are a young, healthy adult looking to improve how efficiently your muscles generate force, adding just 4.5 grams of Alaska Pollack Protein to your daily diet for 3 months may help. You likely won't see your muscles get bigger, but your nervous system may become more efficient at producing force, allowing you to generate the same strength with less neural effort compared to taking whey protein.

Ultrasound measurement of vastus lateralis (VL) muscle thickness, combined with body mass, provides a statistically accurate and ecologically valid prediction of whole-body and thigh fat-free mass (FFM) in resistance-trained men, serving as a viable alternative to DXA.

If you are a resistance-trained man, you can track your muscle gains using a portable ultrasound device focused on your vastus lateralis (side thigh) and your body weight. The study provides a specific formula: Whole Body FFM = -1.657 + (0.719 * Body Mass in kg) + (0.416 * VL Thickness in mm). This method is as accurate as DXA for this group and can be done in a gym setting, allowing you to monitor progress without expensive medical imaging.