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Did You Know? Short, defensible facts on nutrition, resistance training, weight loss, supplements, peptides, aging and longevity, sleep and recovery, and medications. Every fact links to a primary government or agency source, with a plain-English note on why it matters. This page is educational information only and is not medical or dosing advice.
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The Dietary Guidelines for Americans set a wide acceptable protein range of 10–35% of daily calories, rather than one fixed number for everyone.
Why it matters: Knowing there's a range (not a single "correct" gram target) helps beginners stop chasing extreme numbers and instead build meals around consistent, adequate protein.
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The Dietary Guidelines for Americans set a wide acceptable protein range of 10–35% of daily calories, rather than one fixed number for everyone.
Among U.S. adults 71 and older, roughly half of women and about 30% of men do not consume enough protein.
"Nutrient recommendations" aren't one number: the Dietary Reference Intakes include separate RDA, Adequate Intake, Estimated Average Requirement and Upper Limit values.
The CDC's Physical Activity Guidelines recommend adults do muscle-strengthening activity on 2 or more days per week, working all major muscle groups.
CDC guidance specifies that muscle-strengthening sessions should work all major muscle groups: legs, hips, back, abdomen, chest, shoulders and arms.
According to the CDC, adults who sit less and do any amount of moderate- or vigorous-intensity activity gain some health benefit, even below the full recommended amount.
More than 2 in 5 U.S. adults (41.9% in the CDC's 2017–2020 data) have obesity, defined as a BMI of 30.0 or higher.
Severe obesity (BMI 40+) among U.S. adults rose from 4.7% in 1999–2000 to about 9.7% in the most recent CDC data, even as overall obesity growth has leveled off.
Obesity-related medical expenditures in the U.S. were estimated at nearly $173 billion (2019 dollars) by the CDC.
Under the 1994 Dietary Supplement Health and Education Act (DSHEA), a dietary supplement is legally distinct from a conventional food or a drug, based on its intended use and labeling.
The FDA does not approve dietary supplements for safety and effectiveness before they go on sale; manufacturers are responsible for ensuring their own products aren't adulterated or misbranded.
Any dietary ingredient not sold in a U.S. supplement before October 15, 1994 is classified as a "new dietary ingredient," which requires the manufacturer to submit specific safety information to the FDA.
Semaglutide (marketed as Ozempic and Wegovy) is a peptide-based GLP-1 receptor agonist, first approved by the FDA in 2017 for type 2 diabetes before later approvals expanded its use.
Both Ozempic and Wegovy carry an FDA boxed warning about thyroid C-cell tumors observed in rodent studies, though it remains unknown whether this risk applies to humans.
Wegovy's FDA-approved uses have expanded over time beyond weight management to include reducing cardiovascular event risk and treating MASH (metabolic dysfunction-associated steatohepatitis) in eligible adults.
An NIA-funded clinical study found that cutting calorie intake by about 12% for two years slowed the measured pace of biological aging in healthy, non-obese adults.
NIA-funded researchers developed a Social Frailty Index, a short survey about social characteristics, that accurately predicts four-year mortality risk in older adults.
An NIA-linked study found that higher olive oil consumption was associated with a lower risk of dementia-related death.
The CDC recommends adults ages 18–60 get 7 or more hours of sleep per night for good health.
CDC survey data show the share of U.S. adults getting insufficient sleep (fewer than 7 hours) has stayed roughly stable from 2013 to 2022, ranging from about 30% to 46% depending on the state.
The CDC lists getting enough sleep among the factors linked to lower risk of type 2 diabetes, heart disease, high blood pressure and stroke.
About 9 out of 10 prescriptions filled in the United States are for generic drugs.
FDA-approved generic medicines are required to match brand-name drugs in dosage, safety, effectiveness, strength, stability and quality.
The FDA has estimated that generic medications saved Americans roughly $373 billion in a single recent year, with about 93% of generic prescriptions filled for under $20.
