HoldsUp

FoundMyFitness · 2024-08-27 · Rhonda Patrick (host), Layne Norton

Dr. Layne Norton on Building Muscle – Insights on Diet, Training, and Supplements

116 research-tied claims examined: 5 contradicted 13 overstated 14 context 72 supported 12 unverified

13

Overstated

0:15:15Layne Nortonoverstatedmoderate

Scientific studies consistently show that people underreport their calorie intake by 30% to 50%.

"if you look at studies, it's very consistent: people underreport their calorie intake by 30 to 50%." (said at 0:15:15)

Scientific validation studies using recovery biomarkers such as doubly labeled water consistently demonstrate systematic underreporting of dietary energy intake across adults and children. However, the claimed range of 30% to 50% overstates the average magnitude of underreporting for the general population. In general adult cohorts of normal weight and overweight individuals, average underreporting typically ranges between 10% and 30%. Underreporting reaching 30% to ~50% has been documented primarily in specific subgroups, such as individuals with severe obesity or patients reporting severe 'diet resistance' (e.g., a seminal 1992 study by Lichtman et al. found an average underreporting of 47% in diet-resistant subjects).

0:22:30Layne Nortonoverstatedhigh

The typical effect size of SSRIs for depression falls between 0.3 and 0.8.

"And SSRIs fall between like 0.3 to 0.8, like usually the best you see is about 0.8" (said at 0:22:30)

The claim overstates the typical effect size of SSRIs and other second-generation antidepressants for depression. In large-scale systematic reviews and network meta-analyses of randomized, double-blind, placebo-controlled trials, the typical between-group effect size (standardized mean difference or Cohen's d) for SSRIs compared to placebo ranges from approximately 0.20 to 0.35 (small effect), with odds ratios for response generally between 1.37 and 2.13 across all antidepressant classes. Placebo-controlled effect sizes for SSRIs do not typically reach 0.8 (which denotes a large effect size); numbers in the 0.8 range only appear when evaluating uncontrolled, within-group pre-to-post treatment changes that conflate drug effect with the placebo response and natural course of recovery.

0:27:44Layne Nortonoverstatedmoderate

A Danish randomized controlled trial in adults over 65 found that one year of heavy resistance training preserved greater strength, lean mass, and cross-sectional area, and resulted in lower visceral fat, four years after baseline (three years post-cessation) compared to control groups.

"They did a randomized controlled trial, I think it was in a Nordic country, I want to say Denmark, and they had people over age 65 do a year of either high-intensity resistance training... or no resistance training... they had follow-up at one year, and then three years after that, so four years total. And they actually looked at people who stopped resistance training for the three years after. They still had better strength, better lean mass, better cross-sectional area... And even the group that did that one year of resistance training four years after they started had less visceral fat, too." (said at 0:27:44)

The speaker references the 4-year follow-up of the Danish LISA randomized controlled trial in older adults at retirement age, which evaluated 1 year of heavy resistance training (HRT), moderate-intensity training (MIT), or a non-exercising control group (CON), followed for 3 years post-intervention (4 years from baseline). The claim is overstated: while the study confirmed that 1 year of HRT preserved isometric leg strength at 4 years compared to declines in the control and moderate-intensity groups, it did not demonstrate long-term preservation of lean muscle mass, muscle cross-sectional area, or significantly lower visceral fat at the 4-year follow-up.

0:37:00Layne Nortonoverstatedmoderate

On average, beginner and intermediate lifters underestimate the number of repetitions they can achieve before failure by five to six repetitions.

"And actually, there are studies on this, and on average, intermediate and beginner lifters underestimate their repetitions they can achieve by about five to six." (said at 0:37:00)

Studies investigating repetitions-in-reserve (RIR) and proximity to muscular failure confirm that individuals generally underpredict how many repetitions they can complete before reaching momentary failure. However, the average degree of underestimation in controlled prediction studies is typically around 1 to 3 repetitions, rather than 5 to 6. For instance, an experimental investigation by Steele et al. (2020) measuring prediction accuracy in trained individuals found an average underestimation of 2.0 repetitions (95% CI: 0.0 to 4.0). Furthermore, prediction accuracy improves substantially as lifters get closer to actual failure, and multiple studies show that training experience does not consistently alter estimation accuracy by a margin as wide as 5 to 6 repetitions.

0:56:13Layne Nortonoverstatedmoderate

Lifting weights has a far larger positive effect on increasing bone mineral density than nutritional interventions.

"And by the way, the best thing you can do for bone density is lift weights. Like anything you can do nutritionally pales in comparison as to what lifting weights does for bone density. It's a massive effect on bone density." (said at 0:56:13)

While resistance training is effective for preserving and modestly improving bone mineral density (BMD) and bone geometry, characterizing its effect as 'massive' and stating that nutritional interventions 'pale in comparison' is overstated. In randomized trials and meta-analyses, heavy resistance and impact training typically increases lumbar spine and femoral neck BMD by approximately 1% to 3% over 8 to 12 months compared to non-exercising controls. Nutritional interventions (such as dietary calcium and calcium/vitamin D supplementation) also produce modest BMD increases of approximately 0.7% to 1.8% over 1 to 2 years. Resistance training provides substantial functional benefits beyond BMD alone (such as muscle strength, balance, and fall prevention), but the absolute magnitude of its direct effect on BMD is modest and comparable in percentage terms to nutritional measures.

1:22:18Layne Nortonoverstatedmoderate

Losing 10% of body weight can induce a 400 to 500 calorie decrease in non-exercise activity thermogenesis (NEAT) per day.

"But 10% weight loss can also induce a 4- to 500-calorie decrease in NEAT per day." (said at 1:22:18)

A 10% reduction in body weight produces a compensatory decline in total daily energy expenditure (TEE) of approximately 300 to 500 kcal/day (or about 6 to 8 kcal/kg of fat-free mass/day). However, the claim attributes this entire 400- to 500-calorie decline specifically to non-exercise activity thermogenesis (NEAT) / non-resting energy expenditure (NREE). In tightly controlled metabolic studies, non-resting energy expenditure typically accounts for roughly half of this reduction (~150 to 300 kcal/day, or 3 to 4 kcal/kg of fat-free mass/day), with the remainder driven by reductions in resting energy expenditure (REE). Therefore, while a 400- to 500-calorie drop is representative of the total energy expenditure deficit following a 10% weight loss, stating that NEAT alone drops by 400 to 500 kcal/day overstates the magnitude for that single component.

1:38:02Layne Nortonoverstatedmoderate

In the United States, most people consume approximately 65% of their daily protein at dinner.

"most people eat about 65% of their protein at dinner in America." (said at 1:38:02)

Dietary survey data from the United States (such as the National Health and Nutrition Examination Survey, NHANES) confirm that daily protein intake is skewed toward the evening meal, but dinner accounts for roughly 40% to 50% of total daily protein intake rather than 65%. In NHANES data across US adults, typical protein intake at dinner ranges between 24.3 and 46.8 g/day, compared to 14.0 to 34.6 g/day at lunch, 5.9 to 22.6 g/day at breakfast, and 4.9 to 16.5 g/day from snacks.

2:13:45Rhonda Patrick (host)overstatedmoderate

Human studies comparing muffins baked with unheated oil versus repeatedly heated oil (such as safflower oil heated 20 times) found that heated oil increased inflammatory markers and oxidized LDL.

"they made muffins, the same muffins with either the like I thought it was a great study, you know, the the 20 times heated oil versus just the cool, like not heated oil. And the heated oils did increase inflammatory markers and they increased oxidized LDL." (said at 2:13:45)

The speaker mischaracterizes the design of the relevant randomized crossover trials. In these human trials (e.g., Camargo et al., 2012 and 2014), obese participants consumed muffins prepared with oils that had all undergone 20 heating cycles (comparing heated sunflower oil against heated virgin olive oil or heated seed oil with added polyphenols/antioxidants). The study did not compare heated oil against unheated ('cool') oil. Heated sunflower oil did significantly increase postprandial inflammatory gene expression (such as NF-κB activation, IL-1β, and IL-6 mRNA) and endoplasmic reticulum stress markers relative to polyphenol-rich olive oil, but the trials were designed to test the protective effects of phenolic antioxidants in frying oils, not unheated versus 20-times-heated oil.

2:20:48Layne Nortonoverstatedmoderate

In a political psychology study, presenting objective counterevidence to Democrats and Republicans reinforced their pre-existing beliefs as strongly as supportive information.

"I go back to this very classic study in politics where they took a group of Democrats and a group of Republicans and they showed both information that would either refute or support a pre-existing belief that they already held, uh same thing for both groups. What they found was it didn't matter, Democrat, Republican, both things that like objectively refuted, like here is the here is the the hard evidence, it shows that what you believe is wrong, that was just of as effective as proof that they were right as reinforcing their personal beliefs." (said at 2:20:48)

The speaker accurately describes the concept of the worldview 'backfire effect' (or extreme biased assimilation)—where presenting objective counterevidence causes partisans to strengthen their original misperceptions just as much as supportive evidence would. This idea originated in early political psychology studies (e.g., Nyhan & Reifler, 2010, studying responses to fact-checks). However, extensive subsequent research has demonstrated that backfire effects are not a robust or general empirical phenomenon. A comprehensive body of evidence, including large-scale replication attempts and systematic reviews, shows that objective corrective information typically increases belief accuracy in both Democrats and Republicans rather than reinforcing their original misperceptions. While political misperceptions can persist due to media cues or belief decay over time, the claim that counterevidence is just as effective as supportive evidence at reinforcing pre-existing beliefs overstates the strength and generalizability of backfire effects.

2:29:28Layne Nortonoverstatedmoderate

Randomized controlled trials and meta-analyses comparing substituting regular soda with water versus diet soda found that diet soda resulted in greater weight loss than water.

"And in several randomized controlled trials and meta-analyses now where they compare substituting regular soda with either water or diet soda, they actually see diet soda produce more weight loss than water." (said at 2:29:28)

The claim is overstated. While at least one large randomized controlled trial found that non-nutritive sweetened (diet) beverages led to greater weight loss than water over a 1-year behavioral weight-loss program (6.21 kg vs 2.45 kg; Peters et al., 2016), the broader randomized trial literature is mixed. The CHOICE trial (Tate et al., 2012) found no statistically significant difference in weight loss between substituting caloric beverages with diet beverages (-2.5%) versus water (-2.03%). Furthermore, other randomized trials (Madjd et al., 2015) found that replacing diet beverages with water resulted in significantly greater weight loss than maintaining diet beverage intake (-8.8 kg vs -7.6 kg at 24 weeks).

2:36:21Layne Nortonoverstatedlow

A Canadian cohort study by Maximova examining tertiles of unprocessed red meat and fruit/vegetable intake found that red meat had a negative impact on cancer at low fruit and vegetable intake, but at high fruit and vegetable intake combined with high red meat intake, there was a protective effect on cancer with a relative risk of approximately 0.78.

"and there was a really, in my opinion, an elegant study, a cohort out of Canada, and I think it was by a researcher named Maximova, I want to say Maximov, Maximova, Max something, and they looked at tertiles of unprocessed red meat intake and tertiles of fruit and vegetable intake. So you had, you know, low, medium, and high of each. At low intakes of fruit and vegetables, red meat had a negative impact on cancer. At high intakes of fruits and vegetables and high intake of red meat, there was actually a protective effect of red meat on cancer. I think it was like a relative risk of 0.78, so like a 22% relative risk reduction." (said at 2:36:21)

A prospective cohort study by Maximova et al. (2020) using data from Alberta's Tomorrow Project (n = 26,218) examined the joint associations of meat intake (red and processed) and protective foods (fruits and vegetables, whole grains, fiber) with cancer risk. The study found that low fruit and vegetable intake combined with high processed meat intake significantly increased cancer incidence compared to high fruit/vegetable and low meat intake, and that high fruit and vegetable intake mitigated the elevated risk associated with meat. However, the study did not demonstrate an independent protective effect of red meat on cancer; associations for unprocessed red meat were weaker and less consistent than for processed meat, and joint dietary pattern models reflect the protective influence of high plant food consumption rather than a beneficial effect of red meat.

2:32:15Layne Nortonoverstatedmoderate

Soluble fermentable fiber serves as fuel for the gut microbiome and produces short-chain fatty acids like butyrate and propionate, which show positive metabolic health benefits in randomized controlled trials.

"there's this thing called soluble fermentable fiber that actually is the main fuel for the gut microbiome. And of all the things we know that actually help with the gut microbiome, that's like the biggest lever is fermentable soluble fiber, and that produces things like butyrate, propionate, which have positive metabolic health benefits in many randomized controlled trials." (said at 2:32:15)

While soluble fermentable fiber is metabolized by gut microbiota into short-chain fatty acids (SCFAs) such as acetate, propionate, and butyrate, claiming that these specific SCFAs have established positive metabolic health benefits across randomized controlled trials (RCTs) overstates the clinical evidence in humans. A systematic review and meta-analysis of human RCTs examining direct SCFA administration found that acetate, propionate, butyrate, and mixed SCFAs had no significant overall effect on blood glucose or insulin levels, with the exception of acute vinegar (acetic acid) intake, and noted high uncertainty and risk of bias across trials.

3:18:53Layne Nortonoverstatedhigh

Creatine supplementation increases intracellular water and total body water, but does not increase extracellular water.

"So the water is all intracellular. It doesn't increase extracellular water. ... it does increase total body water and intracellular water" (said at 3:18:53)

Creatine supplementation consistently increases total body water (TBW) and intracellular water (ICW) due to the osmotic draw of creatine accumulated inside muscle cells. However, stating that the water gained is 'all intracellular' and 'doesn't increase extracellular water' is an overstatement. Gold-standard dilution studies (using deuterium oxide and sodium bromide) and bioimpedance assessments show that creatine supplementation increases TBW while maintaining normal fluid distribution across intracellular and extracellular compartments.

Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.