Health.

“About 16,000 children participated in the Bogalusa Heart Study over about 40 years.”

The evidence does not support the claim as stated. Reliable sources consistently report more than 12,000 children in the Bogalusa Heart Study, while the figure above 16,000 refers to total participants overall. The study also spans roughly 50 years since 1973, although some older descriptions referred to nearly 40 years of follow-up.

“In the Bogalusa Heart Study, about 25% of participants reached a healthy weight as adults and about 75% remained overweight or obese.”

The evidence does not support the claimed 25%/75% adult weight split in the Bogalusa Heart Study. Cohort-wide figures cited in the underlying literature are far lower than 75% overweight/obese in adulthood, including about 42% in one young-adult analysis and 57.7% overweight in another follow-up measure. The claim appears to misread subgroup tracking results as if they described all participants.

“In the 1970s, about 5% of children in the United States were obese, and at the time a referenced documentary was made, about 17% of children in the United States were obese.”

The historical comparison is broadly accurate. CDC data put U.S. childhood obesity at roughly 5% in the early 1970s and about 17% in 2009-2010, a figure widely cited at the time. The caveat is that the 17% number depends on when the documentary was made; later estimates were higher.

“About one-third of Americans have excess liver fat.”

The broad takeaway is supported: recent U.S. evidence commonly places fatty liver in roughly 30% of adults, making “about one-third” a reasonable shorthand. The strongest support comes from national survey analyses and review articles showing prevalence near that level. The claim is not fully precise because estimates vary by definition and testing method, and many studies measure adults rather than all Americans.

“Cheap synthetic underwear fabrics such as pure polyester or nylon trap sweat and bacteria against the skin more than cotton underwear does.”

The evidence strongly supports the core takeaway that cotton underwear is generally less likely than pure polyester or nylon to hold sweat and foster odor-related bacterial buildup next to the skin. Clinical guidance and textile studies consistently favor cotton for breathability and moisture control. The main caveat is that fabric blends, knit structure, and moisture-wicking treatments can affect performance.

“Swallowing chewing gum can cause intestinal problems.”

The evidence supports a real but uncommon risk. Swallowed gum usually passes without harm, but documented medical cases show it can contribute to bezoars, impaction, and intestinal obstruction. The claim is accurate because it says gum can cause intestinal problems, not that it usually does.

“Pharmaceutical companies do not promote male contraceptives.”

The evidence supports a narrower claim that big pharmaceutical companies have mostly abandoned male contraceptive development. It does not support the broader claim that pharmaceutical companies do not promote male contraceptives at all, because smaller pharma and biotech firms are actively developing and publicizing male-contraceptive products. The statement overstates a real trend into an absolute.

“There is insufficient scientific evidence to conclude that depression is caused by neurotransmitter changes in the brain.”

Current evidence does not justify concluding that depression is caused by neurotransmitter changes alone. The strongest reviews find the classic serotonin/chemical-imbalance theory unproven, while major medical institutions describe depression as multifactorial and not fully understood. Neurotransmitters are involved in depression biology, but causation has not been established.

“AI chatbots are suitable for treating mental health conditions and can replace a human therapist.”

Available evidence supports AI chatbots only as limited support tools, not as substitutes for therapists. Some studies show short-term symptom improvement for mild depression or anxiety, but these findings come from narrow trials and do not demonstrate equivalence to human psychotherapy. Major medical and psychological authorities warn that chatbots can miss crises, give unsafe advice, and should not replace qualified mental health care.

“Writing a gratitude journal improves psychological well-being.”

Available evidence supports a real but modest benefit. Meta-analyses and randomized studies generally find that gratitude journaling or similar gratitude-writing exercises improve psychological well-being and reduce negative affect, though effects are usually small. The claim is accurate as a directional statement, but it should not be read as implying large, guaranteed, or clinical-level improvement.

“In the United States, the average adult height of Black people is higher than the average adult height of non-Hispanic White people.”

Nationally representative CDC data do not support this comparison. Recent NHANES estimates show non-Hispanic White men are taller on average than Black men, while Black women are only negligibly taller than non-Hispanic White women; taken together, that does not yield a higher overall adult average for Black people.

“A person who previously had chickenpox (varicella) can become a carrier and transmit varicella after contact with an infected person.”

The evidence does not support a post-exposure 'carrier' state in people who already had chickenpox. Public health sources describe spread from active varicella infection, while prior infection usually gives durable immunity and re-exposure typically only boosts antibodies. Rare reinfection is possible, but that is a different situation from becoming an asymptomatic carrier who then transmits varicella.

“Use of Sparx Maths in schools can place excessive pressure on students.”

The available evidence indicates that Sparx Maths can place excessive pressure on some students. This conclusion is supported by consistent user reports and by general research showing that demanding maths tasks can trigger anxiety. However, no strong independent study in the provided record measures how often Sparx causes this problem or isolates it from broader homework and maths-related stress.

“Spending long periods on repetitive mathematics questions on Sparx Maths can lead to frustration and anxiety.”

The evidence supports the claim in broad terms: long, repetitive maths practice can contribute to frustration and math anxiety, and user reports indicate this can happen on Sparx Maths. However, there is no strong peer-reviewed study directly measuring anxiety caused by Sparx specifically. So the practical risk described is credible, but the platform-specific link is not yet firmly established by high-quality direct research.

“There is a zombie outbreak in the United States.”

The claim is not supported by any credible evidence. Official U.S. and international health agencies do not report a zombie outbreak, and the CDC’s zombie materials were created as fictional preparedness tools, not outbreak announcements. References to zombie plans or “zombie viruses” are hypothetical, metaphorical, or about unrelated scientific topics, not evidence of undead people in the United States.

“Under thermal stress, elevated cortisol can reduce testosterone levels, affecting sexually dimorphic traits.”

The evidence supports the claim in broad terms. Heat or thermal stress can be associated with higher cortisol and lower testosterone, and glucocorticoids are well documented to suppress testosterone production. The main caveat is that heat can also lower testosterone through other pathways, so cortisol is a plausible mechanism, not always the sole or primary one; effects on sexually dimorphic traits are better supported for sustained hormone changes than for short-term stress.

“A memorandum issued by the U.S. Department of Health and Human Services states that U.S. states may reduce Medicaid home- and community-based services (HCBS) for people with disabilities.”

No identified HHS memorandum says states may reduce Medicaid HCBS for people with disabilities. Federal HHS/CMS documents in the evidence set concern HCBS compliance, access, and implementation, not permission to cut services. The claim appears to confuse general Medicaid flexibility over optional benefits—and possibly a separate DOJ memo—with the contents of an HHS memorandum.

“Chemotherapy-induced peripheral neuropathy (CIPN) can cause persistent dysfunction of the hands and feet that interferes with daily activities and reduces quality of life.”

The evidence strongly supports this statement. Chemotherapy-induced peripheral neuropathy is well documented as sometimes persisting after treatment, especially in the hands and feet, and studies link it to difficulty with daily tasks, falls, disability, and reduced quality of life. The wording is appropriately cautious because it says this can happen, not that it happens to every patient.

“Degenerative cervical myelopathy (DCM) severity can fluctuate over time and may not be fully captured during episodic clinic visits.”

Available evidence strongly supports both parts of the statement. Degenerative cervical myelopathy is commonly described as variable or stepwise over time, and some sources report severity can change even day to day. Studies also show that episodic clinic assessments, especially tools such as mJOA, may miss clinically meaningful progression or burden between visits.

“In degenerative cervical myelopathy (DCM), smartphone-assessed motor performance correlates with standard clinical grading and with postoperative improvement.”

Available evidence supports the claim in broad terms. Peer-reviewed studies in DCM show smartphone-derived motor or mobility measures correlate with established clinical measures such as mJOA, VAS, and ODI, and some studies show these measures improve after surgery in parallel with clinical recovery. However, several findings are preliminary, some correlations are modest or inconsistent across scales, and early feasibility evidence was very small.