Browse the evidence

Peak week strategies in non-drug-free bodybuilders, including supraphysiological anabolic steroid use, diuretics, and severe caloric/water restriction, fail to prevent significant losses in lean mass markers and resting metabolic rate.

If you are preparing for a physique competition using performance-enhancing drugs and extreme peak week strategies, be aware that these methods often fail to preserve lean muscle mass and metabolic rate. The combination of high-volume cardio, severe caloric restriction, and polypharmacy can lead to significant muscle loss despite the use of steroids. Individualize your protocol rather than copying a single coach's 'one-size-fits-all' approach, and prioritize muscle preservation over extreme dehydration tactics.

Adipose-specific overexpression of UCP1 via hADP promoter-modified plasmids induces thermogenesis and energy expenditure, leading to significant fat mass loss without lean mass loss in obese mice.

This research suggests that stimulating fat tissue to burn energy (thermogenesis) via a specific gene therapy could reduce fat mass without losing muscle. While promising in mice, this is not yet a human treatment. The key takeaway is that targeting energy expenditure in fat cells is a viable strategy for obesity, potentially avoiding the gut side effects of current drugs like GLP-1 agonists.

The ketone body β-hydroxybutyrate (βHB) inhibits glucose-induced GLP-1 secretion in enteroendocrine cells, with human jejunal enteroids showing sensitivity at much lower doses (10 mM) than murine cell lines (100 mM).

This research suggests that high concentrations of ketone bodies in the gut can suppress the release of GLP-1, a hormone that helps manage blood sugar and signals fullness. While this is a laboratory finding using human gut cells, it implies that metabolic states with high local ketone production (such as during fasting or specific dietary patterns) might alter how your body responds to carbohydrates by reducing this specific hormonal signal.

Intragastric balloons (IGBs) provide modest short-term weight loss (approx. 13% TBWL at 6 months) but are associated with higher adverse event rates and significant weight regain long-term, limiting their standalone efficacy.

IGBs can help you lose about 13% of your body weight in the first 6 months, but they are not a permanent solution. You will likely experience nausea and pain, and many people regain the weight after the balloon is removed. They are best used as a short-term tool to kickstart weight loss or as a bridge to surgery, combined with strict lifestyle changes.

GLP-1 receptor agonists (GLP-1RAs) do not increase the risk of adverse events compared to non-GLP-1RA antiobesity medications in patients who have undergone bariatric surgery.

If you have had bariatric surgery and are considering GLP-1 medications (like semaglutide or liraglutide) for weight regain, current data suggests they are not more likely to cause adverse events than older weight loss medications. However, the study notes that starting these medications more than 12 months after surgery is associated with a significantly lower risk of adverse events compared to starting them within the first year.

Tirzepatide is associated with a higher likelihood of gastrointestinal adverse events compared to other GLP-1 receptor agonists (semaglutide, dulaglutide, liraglutide, and exenatide).

If you take tirzepatide, expect gastrointestinal issues like nausea or vomiting more often than with other GLP-1 drugs. These are usually mild and go away, but they are the most common reason people stop the medication. Monitor your symptoms and report them.

College students overwhelmingly perceive no-fat food preparations as healthier than those containing unsaturated or saturated fats, despite nutritional guidelines recommending unsaturated fats.

Stop avoiding fat. Choose foods with unsaturated fats (like olive oil, nuts, avocados) over no-fat options. The type of fat matters more for your health than simply removing fat from your diet.

Oral delivery of GLP-1 analogs (semaglutide, exenatide, dulaglutide) using liposomes containing tetraether lipids (TELs) and cell-penetrating peptides (CPPs) significantly increases cellular uptake in intestinal epithelial models compared to free peptides or conventional liposomes.

This research suggests a promising future where GLP-1 drugs (like Ozempic or Wegovy) could be taken orally using advanced liposome technology, potentially replacing injections. Currently, this is pre-clinical data showing high uptake in cell models, not a available product.

Acute L-arginine supplementation (6–8 g) taken 60–90 minutes before strength training provides no ergogenic effect on muscular endurance, peak torque, or resistance rate.

Do not take L-arginine specifically to boost your strength training performance. Taking 6-8 grams an hour before lifting does not increase your strength, endurance, or muscle growth compared to a placebo. While it may increase blood flow, this does not help you lift more weight or do more reps.

In patients with type 2 diabetes and baseline eGFR <80 mL/min/1.73 m2, intensive lifestyle intervention is associated with a slightly higher mean eGFR over 10 years compared to usual care, suggesting a potential benefit in preserving kidney function in this subgroup.

If your kidney function is already slightly reduced (eGFR <80), an intensive lifestyle program may help you maintain a slightly higher average kidney function level over 10 years compared to standard care. While it may not stop the decline entirely, it might offer a small protective benefit. Discuss this with your doctor to see if you are a candidate.

The doubly labeled water (DLW) method systematically overestimates energy expenditure differences when comparing low-carbohydrate diets to moderate-carbohydrate diets, likely due to isotopic fractionation and biosynthetic fluxes (e.g., de novo lipogenesis) that violate DLW assumptions.

If you are using the Doubly Labeled Water method to prove that low-carb diets burn more calories, be cautious. This study suggests the method may falsely show an increase due to how it handles isotopes during low-carb metabolism. Other rigorous measures (respiratory chambers, body composition changes) did not show this increase. Therefore, claims of a significant metabolic boost from low-carb diets based solely on DLW data may be overstated.

Compounded GLP-1 receptor agonists (semaglutide, tirzepatide) are widely marketed for weight loss in Colorado, but these products lack FDA approval for safety and efficacy, are often mislabeled as 'generic' or 'FDA-approved', and may contain unsafe additives like BPC-157 or unapproved salt forms.

Be aware that compounded GLP-1 drugs sold directly to consumers are not FDA-approved for safety or efficacy. They may contain impurities, incorrect doses, or unsafe additives like BPC-157. Marketing claims of 'FDA approval' or 'generic' status are misleading. Consult a healthcare provider to understand the risks and legal status of these products.

Subcutaneous administration of a semaglutide-rosuvastatin-lipid conjugate nanoparticle (SRLC NP) formulation significantly reduces body weight and improves liver function markers in high-fat diet-induced obese mice compared to conventional semaglutide or individual components.

This research describes a novel experimental nanoparticle formulation combining semaglutide with a statin-lipid conjugate. In obese mice, this specific formulation led to significant weight loss and liver health improvements compared to standard treatments. However, this is preclinical data; it is not a current treatment option for humans, and the safety and efficacy in people remain unproven.

Dihydromyricetin (DHM) supplementation improves insulin resistance and glucose tolerance in high-fat diet-induced mice by modulating gut microbiota to increase chenodeoxycholic acid (CDCA), which inhibits farnesoid X receptor (FXR) expression in intestinal L cells, thereby increasing glucagon gene (Gcg) mRNA expression and enhancing glucagon-like peptide-1 (GLP-1) secretion.

This research suggests that Dihydromyricetin (DHM), a compound found in plants like Ampelopsis grossedentata, may help improve insulin sensitivity and blood sugar control by changing gut bacteria to produce more beneficial bile acids (CDCA). This process boosts GLP-1, a hormone that helps regulate blood sugar. While this was shown in mice fed a high-fat diet, it points to the importance of gut health in metabolic function. For humans, this implies that dietary sources of DHM or gut-health-supporting strategies might be a complementary approach to managing insulin resistance, though human dosing and efficacy are not yet established.

Dysregulation of hypothalamic nuclei (specifically AgRP and POMC neurons in the arcuate nucleus) is a primary driver of obesity and type 2 diabetes through mechanisms involving insulin resistance, hyperphagia, and disrupted glucose sensing.

Metabolic diseases like obesity and diabetes are not just about willpower or peripheral fat storage; they involve critical signaling centers in the brain (the hypothalamus). When these signals (like leptin and insulin) are disrupted, it drives hunger and insulin resistance. This understanding supports the use of therapies that target these central pathways, such as GLP-1 receptor agonists, to help restore metabolic balance.

AgRP neuron hyperactivity contributes to chronic insulin resistance and obesity by inducing brown adipose tissue-derived myostatin expression, which systemically inhibits insulin signaling in skeletal muscle and white adipose tissue.

This mechanism explains why some individuals with obesity struggle with insulin resistance beyond just fat mass. It suggests that targeting the AgRP-myostatin pathway could be a therapeutic strategy, although current treatments focus more broadly on GLP-1 and MC4R pathways.

Integrating structured intake tools (like the Obesity Brief HPI) into electronic medical records can increase the identification and prioritization of weight management visits, although adoption was zero in this baseline period.

Health systems are starting to use digital tools to make weight management easier. If your clinic uses these tools, expect a questionnaire before your visit. This is designed to help your doctor understand your history better, not to burden you.

Tirzepatide reduces MC38 colon tumor growth rates in diet-induced obese mice by approximately 50%, but this effect is indirect and mediated by reduced food intake, lower insulin, and lower leptin levels rather than direct anti-proliferative action on cancer cells.

For obese individuals with early-stage, insulin-sensitive cancers (like colon cancer), tirzepatide may help slow tumor growth. This benefit appears to come from reducing insulin and leptin levels through weight loss and appetite suppression, not from directly attacking the cancer cells. It is not a cure, but it may improve outcomes by altering the metabolic environment that fuels cancer growth.

Ingestion of an isonitrogenous non-essential amino acid (NEAA) formulation does not stimulate muscle protein synthesis (MPS) or activate mTOR signaling pathways in skeletal muscle cells, making it an effective non-bioactive control for protein bioactivity studies.

If you are looking to stimulate muscle growth, consuming non-essential amino acids (NEAA) alone will not trigger the necessary biological signals. Muscle protein synthesis is driven by essential amino acids (EAAs), specifically leucine. Use NEAA as a control or filler in studies, but rely on complete proteins or EAAs for actual muscle building effects.

Physical activity time and variability are not significantly associated with glycemic variability indices (MAGE, CONGA, MODD) in overweight or obese adults.

Do not rely on exercise alone to stop blood sugar spikes or swings if you are overweight. While exercise helps lower your average blood sugar, this study suggests it may not reduce the magnitude of glucose fluctuations. Focus on total movement time rather than expecting it to smooth out glucose curves.

In patients with advanced chronic kidney disease (CKD) or end-stage renal disease (ESRD), higher BMI is paradoxically associated with lower mortality rates, likely due to nutritional reserves and muscle mass.

If you have advanced kidney disease, being overweight might actually protect you from early death by providing essential energy and muscle reserves. Discuss weight management goals with your nephrologist, as the strategy may differ from general population advice.

A two-meals-a-day ketogenic diet may cause an increase in serum uric acid levels in patients with type 2 diabetes.

Monitor uric acid levels when starting this diet, as it may rise. This is a known trade-off of ketosis.

There is no significant association between competitor characteristics (age, sex, drug status, level) and the use of carbohydrate-based peaking strategies or the length of the peaking strategy.

Do not assume your carbohydrate strategy must change based on your sex, age, or drug status. The study found no link between these factors and CHO strategy choice. However, be aware that the *range* of carbohydrate intake (high vs low days) during peak week is significantly influenced by sex.

Sex is a significant predictor of the disparity (range) between highest and lowest daily carbohydrate intakes during peak week, with males exhibiting a wider range than females.

If you are male, expect to cycle your carbohydrates more aggressively (higher highs and lower lows) during peak week than if you are female. The study found sex was the only significant factor predicting this disparity.