Browse evidence-based analysis of health-related claims and assertions
Eating more fruits and vegetables for 3 months makes the level of alpha-carotene—a plant nutrient—in the blood go up by 50% in people who didn’t eat much before.
Causal
When people eat a lot more fruits and veggies for 3 months, the levels of two important plant pigments—beta-carotene and lutein—in their blood jump by 70%, showing their body is absorbing more of these beneficial compounds.
Eating more fruits and veggies for 3 months raises the level of folate (a B vitamin) in the blood by 15% in people who used to eat very little of them, helping their body make healthy cells.
When people who don't eat much fruit or veggies start eating about 8 servings a day for 3 months, the level of vitamin C in their blood goes up by 35%, meaning their body gets more of this important nutrient.
Zerumbone slightly increases harmful molecules (ROS) in skin cells before UVA hits—this small rise is actually needed to activate the cell’s defense system.
Mechanistic
Zerumbone turns up the volume on a genetic switch (ARE) that controls antioxidant genes—more zerumbone means louder activation.
Zerumbone stops skin cells from making too much of an enzyme that breaks down collagen, helping keep skin structure intact after UVA exposure.
Quantitative
When scientists turned off the Nrf2 gene, zerumbone lost its ability to protect skin cells from UVA damage—proving Nrf2 is necessary for its effect.
Zerumbone doesn’t just use one path to activate the cell’s defense system—it uses at least seven different signaling routes to turn on protective genes.
Zerumbone turns on two important antioxidant genes (HO-1 and γ-GCLC) in skin cells, helping them fight off damage—HO-1 stays turned on for a full day.
Zerumbone helps a master switch (Nrf2) move into the nucleus of skin cells, turning on protective genes—this happens within 30 minutes to 4 hours.
Zerumbone blocks the activation of two proteins (c-Fos and c-Jun) that tell skin cells to break down collagen when exposed to UVA light.
When skin cells are damaged by UVA light, they start acting old—zerumbone helps them stay young by reducing this 'aging marker' by more than half.
Zerumbone helps skin cells in a dish clean up harmful molecules (ROS) that are made when they’re exposed to UVA light—more zerumbone means less damage.
A natural compound called zerumbone, when applied to skin cells in a lab, helps them survive better after being exposed to UVA light—especially at higher doses.
Most people who came in with constipation were already eating a lot of fiber—so they weren’t lacking it, which challenges the idea that fiber deficiency causes constipation.
Descriptive
A few people went back to eating fiber even though they felt better without it—mostly because of their beliefs or culture, not because they felt worse.
People who cut back on fiber didn’t just feel better right away—they kept feeling better for at least six months.
This study shows that people with constipation don’t need fiber to poop normally—many felt better when they stopped eating it.
Cutting fiber might help constipation because it makes poop smaller and less gas is made in the gut, so it’s easier to go and you don’t feel as bloated.
People with constipation who kept taking fiber pills or eating lots of whole grains didn’t feel better—even if they tried to change their habits, the fiber kept them feeling the same.
Correlational
Men and women were equally likely to choose to stop, reduce, or keep eating fiber after being advised to change their diet.
Older people with constipation were a bit less likely to stop eating fiber, but it wasn’t a big or clear difference—age didn’t strongly predict who changed their diet.
Most people with chronic constipation chose to keep eating less fiber after trying it, because they felt better—only a few went back to eating lots of fiber.