1 What metal makes up the largest single ingredient in dental amalgam?
Platinum
Gold
Mercury
Dental amalgam contains metals like silver, tin, and copper, but mercury makes up the largest share. Learn more.
Silver
2 Which is not a marker of biological age?
Metabolism
Inflammation
Organ health
Blood type
Biological age is tied to body function, including metabolism, inflammation, and organ health. Blood type does not show how fast the body is aging. Learn more.
3 What percentage of U.S. adults fall short on magnesium intake?
80%
Nearly 80% of U.S. adults do not get enough magnesium, which can limit how well the body activates and uses vitamin D. Learn more.
47%
67%
35%
4 Which symptom may be a sign of low vitamin D?
Slower nail growth
Pale skin
Frequent illness
Low vitamin D is linked to frequent illness, fatigue, poor bone strength, and low mood because vitamin D supports immunity and overall health. Learn more.
Sharper night vision
5 According to research, how many minutes of aerobic exercise may help lower stress levels?
20
88
150
About 150 minutes of moderate-to-vigorous aerobic exercise per week was enough to lower cortisol and improve fitness over time. Learn more.
175
6 What type of plastic particle can enter living cells?
Bioplastics
Nanoplastics
Nanoplastics are tiny enough to enter living cells, while microplastics are larger fragments that can build up in the body and environment. Learn more.
Microbeads
Green polymers
7 What do peroxisome proliferator-activated receptors (PPARs) help control?
Fat-burning, energy use, and inflammation
Peroxisome proliferator-activated receptors (PPARs) are protein switches that help regulate fat-burning, energy use, and inflammation. Learn more.
Skin color, eyesight, and hair growth
Bone length, tooth shape, and appetite
Water balance, sweating, and breathing speed
1 By weight, how much mercury is usually found in dental amalgam fillings?
10%
25%
35%
50%
Dental amalgam fillings are about 50% mercury by weight. Researchers found adults with amalgam fillings carried significantly higher blood mercury levels than people without them. Learn more.
2 Why is linoleic acid (LA) harmful to the skin?
Skin cells use it to block all sunlight
Oxidation creates toxic byproducts during sun exposure
Linoleic acid (LA) can oxidize in skin cell membranes during sun exposure, forming toxic byproducts like 4-HNE that may damage DNA and speed skin aging. Learn more.
Melanin production stops as soon as LA is eaten
Pores close tightly and trap moisture inside
3 How can mercury from fillings spread throughout the body?
It stays locked inside the filling forever
It leaves only when the tooth is removed
It turns harmless once mixed with saliva
It releases as vapor during chewing or heat exposure
Chewing, grinding, and hot foods can release mercury vapor, which may enter the blood and travel into organs, tissues, the brain, and placenta. Learn more.
4 Which factor does not accelerate brain aging?
Chronic stress
Pollution
Meditation
Brain aging can speed up when stress, pollution, and metabolic strain build up. A steady meditation routine may help lower stress instead. Learn more.
Plant-based diets
5 Which statement is not true about cardiovascular-kidney-metabolic (CKM) syndrome?
It links heart, kidney, and metabolic dysfunction
It affects only a small number of U.S. adults
Nearly 90% of U.S. adults have at least one CKM risk factor, so it is not rare. Early action may help protect heart, kidney, and metabolic health. Learn more.
Early metabolic changes may help reverse many cases
Poor diet and chronic stress can drive related problems
6 What does isolated REM sleep behavior disorder (iRBD) cause people to do?
Act out dreams while asleep
Isolated REM sleep behavior disorder (iRBD) can cause shouting or movements during dreams and may be an early warning sign of Parkinson’s or Lewy body dementia. Learn more.
Stop dreaming completely at night
Sleep longer without waking up
Forget dreams after waking
7 Which of these may be a sign of low vitamin D?
Slower nail growth
Stronger appetite
Frequent illness
Low vitamin D is linked to frequent illness, fatigue, poor bone strength, and low mood because vitamin D supports immunity and overall health. Learn more.
Sharper night vision
8 How does a cysteine-rich diet help with gut health?
It blocks all immune activity in the gut
It removes the need for intestinal bacteria
It stops digestion so the gut can rest
It activates stem cells that repair the gut lining
Cysteine helps trigger repair signals between intestinal and immune cells, supporting stem cells that rebuild the gut lining after damage. Learn more.
9 If someone has dexterity issues, what can be used instead of floss?
Cotton swabs
Soft plaque removers
Soft plaque removers can clean between teeth with one hand, making them easier to use when regular flossing is difficult. Learn more.
Whitening strips
Tongue scrapers
10 How much glycine does the body use daily for collagen alone?
About 3 grams
Around 6 grams
Nearly 9 grams
Roughly 12 grams
The body uses about 12 grams of glycine daily for collagen, while normal production and diet may leave a gap of around 10 grams. Learn more.
11 What molecule helps heat therapy relax and widen arteries?
Nitric oxide
Heat exposure increases blood flow and shear stress, which triggers nitric oxide release. Nitric oxide helps arteries relax and widen, supporting lower blood pressure. Learn more.
Cortisol
Glucose
Histamine
12 What type of fiber helps lower cholesterol?
Soluble fiber
Soluble fiber binds to cholesterol in the gut, helping reduce absorption into the bloodstream and supporting healthier low-density lipoprotein (LDL) levels. Learn more.
Insoluble fiber
Synthetic fiber
Muscle fiber
13 What matters most for reducing stress with exercise?
Training as hard as possible each time
Losing weight before stress can improve
Staying consistent with regular activity
Stress reduction builds gradually through repeated workouts, which teach the body to handle stress more efficiently and recover faster. Learn more.
Avoiding recovery between workouts
14 What makes cognitive disability different from dementia?
Cognitive disability always means permanent memory loss
Cognitive disability is an earlier sign of brain stress
Cognitive disability can mean early problems with focus, memory, or decisions, while dementia is a more advanced form of brain decline. Learn more.
Dementia only affects focus during stressful events
Dementia improves quickly without lifestyle changes
15 Why is blue light from screens harmful?
Night vision becomes too strong after screen use
Screens block all light from reaching the eyes
Melatonin drops and sleep timing gets disrupted
Blue light can lower melatonin and disrupt circadian rhythm, making it harder to fall asleep and shifting normal sleep patterns. Learn more.
Daytime brightness makes screens harder to read
16 Which biodegradable plastics are being studied as greener options?
Polyethylene (PE) and polyvinyl chloride (PVC)
Polystyrene (PS) and polymethyl methacrylate (PMMA)
Polyamide (PA) and styrene-butadiene rubber (SBR)
Polyhydroxyalkanoate (PHA) and polylactic acid (PLA)
Polyhydroxyalkanoate (PHA) and polylactic acid (PLA) can break down under certain conditions, though they are not perfect substitutes yet. Learn more.
17 Which of these may help calm sleep pressure?
Aspirin
Small doses of aspirin may lower free fatty acids and serotonin, which can help reduce drowsiness and support steadier energy during the day. Learn more.
Melatonin
Caffeine
Antihistamines
18 What’s an easy way to test your balance?
Count how many steps are taken each day
Stand on one leg for 10 seconds
Standing on one leg for 10 seconds or doing the timed up and go test can reveal balance problems that may need training or further evaluation. Learn more.
Stretch the legs while sitting in a chair
Walk faster than usual for one minute
19 What well-known drug was C15:0 compared with for effects on AMPK?
Aspirin
Ibuprofen
Metformin
C15:0 was compared with metformin, a common blood sugar medication that engages adenosine monophosphate-activated protein kinase (AMPK). Learn more.
Penicillin
20 At what age does thyroid function gradually decline and anti-cortisol hormones drop more quickly?
Before puberty
Around age 50
After age 25
After age 35
After age 35, thyroid function may gradually decline while anti-cortisol hormones drop faster, raising the risk of cortisol and estrogen excess. Learn more.
21 Which at-home method may help reduce mouth breathing during sleep?
Mouth taping
Mouth taping uses gentle medical tape over the lips to encourage nasal breathing during sleep and may help with snoring or mouth breathing. Learn more.
Hot tea before bed
Throat lozenges
Extra pillows
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