Fitness Claims

Caffeine is the world's most widely consumed psychoactive substance and one of the most researched ergogenic aids in sports science. The cla...

The claim is that cold water immersion (CWI) or cold showers after exercise reduce muscle soreness (DOMS), decrease inflammation, and speed ...

Creatine monohydrate is one of the most extensively studied sports supplements. The claim is that regular creatine supplementation (typicall...

Foam rolling (self-myofascial release) is a fixture of gym recovery routines. This claim is narrow on purpose: does rolling after exercise *...

Large prospective cohorts and meta-analyses covering millions of people consistently find that weaker handgrip strength predicts earlier dea...

The claim is that consuming higher amounts of dietary protein (typically 1.6-2.2 g/kg/day) leads to greater increases in muscle mass during ...

The claim is that adequate sleep quality and duration (typically 7-9 hours per night) plays a critical role in muscle growth and recovery fr...

Post-exercise cold water immersion reliably reduces soreness, but the question here is narrower: does using it habitually after lifting *int...

Electrolyte drinks (sports drinks, oral rehydration solutions, and powdered mixes such as LMNT or Liquid I.V.) are marketed on the premise t...

Montmorency tart cherries contain melatonin and tryptophan, and several small human trials report modest sleep gains: **+34 minutes of sleep...

Vitamin D is fat-soluble and stored in the body, and megadose products (5,000-50,000 IU) are sold freely. The claim is that taking high dose...

Manufacturers of red-light panels, masks and laser devices — and a research literature on photobiomodulation therapy (PBMT) / low-level lase...

The standard advice against "crash dieting" holds that the size of an energy deficit determines how much of the resulting weight loss comes ...

A common training recommendation is that exercises should be performed through a full range of motion rather than partial repetitions to max...

The viral "Japanese walking" method — alternating 3 minutes fast with 3 minutes slow — is unusual among fitness trends in having a real tria...

Coaches, textbooks and popular training advice widely hold that holding a static stretch before a workout or competition acutely impairs sub...

Marketing and much of the popular coverage of creatine now positions midlife and postmenopausal women as the group with the most to gain, ci...

The claim is that training each muscle group with a higher frequency (3 or more times per week) produces greater hypertrophy than a traditio...

A 1996 study found that men who took caffeine alongside a creatine loading phase lost creatine's performance benefit entirely, and the findi...

A common explanation for why regular stretching improves flexibility is mechanical: the muscle is said to be physically lengthened — fascicl...

Intermittent fasting (IF) protocols such as 16:8 or alternate-day fasting have surged in popularity as fat loss strategies. The claim is tha...

Turkesterone is an ecdysteroid from *Ajuga turkestanica*, sold as a "natural anabolic" on the claim that it builds muscle comparably to anab...

A common explanation for stalled fat loss is that the body has entered "starvation mode": metabolism has slowed enough to cancel out the cal...

Berberine is marketed as "nature's Ozempic", which implies a weight-loss effect in the same class as a GLP-1 agonist. The meta-analytic evid...

Vitamin D is widely marketed to lifters and athletes as a performance supplement, on the basis that vitamin D receptors are present in skele...

The "anabolic window" theory claims that consuming protein within a narrow window (typically 30-60 minutes) after resistance exercise is cri...

BPC-157 ("Body Protection Compound 157") is a synthetic pentadecapeptide sold by peptide vendors and prescribed by some wellness clinics as ...

Over-the-counter continuous glucose monitors (Stelo, Lingo, Levels) are marketed to people without diabetes on the premise that seeing your ...

A widely repeated reason women avoid creatine is that it causes noticeable water retention — several pounds of "water weight" and a puffy, b...

"Seed oils" — soybean, sunflower, corn, canola, safflower — are the main dietary source of linoleic acid, an omega-6 fat. The claim, as popu...

One of the most persistent worries about creatine is that it damages the kidneys. The claim is that regular supplementation (typically 3-5 g...

Branched-chain amino acids (BCAAs — leucine, isoleucine, and valine) are widely marketed as supplements that promote muscle protein synthesi...

Social media claims that specific foods ("cortisol-triggering foods") chronically elevate cortisol, producing a "cortisol belly" and a puffy...

The advice not to stir creatine into coffee or tea rests on a real piece of chemistry: creatine in water slowly cyclizes into creatinine, an...

Electrolyte powders and drink mixes are marketed for daily use by the general population, on the premise that ordinary diets and plain water...

The second half of the foam-rolling promise: that rolling after training doesn't just make you *feel* better, but actually restores strength...

A common recommendation in bodybuilding is that dumbbell lateral raises are the superior exercise for targeting the lateral (middle) head of...

A persistent fitness myth is that performing exercises targeting a specific body part (e.g., crunches for belly fat) will reduce fat in that...

A widespread belief in fitness that performing static stretching before exercise reduces the risk of musculoskeletal injuries during the act...

The claim that taking every set to complete muscular failure (inability to complete another rep) is necessary or optimal for maximizing musc...