Browse evidence-based analysis of health-related claims and assertions
When young men slept only 3.5 hours a night for three nights, their bodies produced less of the hormones that tell them they’re full, making them feel hungrier.
Causal
Glyoxal, a toxic chemical formed when oil is heated, is most common in oils like lard and palm oil because they contain myristic acid and oleic acid.
Correlational
When you heat oil, the good unsaturated fats break down and disappear, leaving behind more of the saturated fats — so the oil becomes more saturated over time.
Descriptive
You can tell what kind of oil was heated by the chemicals it makes — hexanal means it had linoleic acid, while octanal and nonanal mean it had oleic acid.
Olive oil, which has lots of oleic acid, makes more of certain toxic aldehydes like 4-HNE and 2-decenal when heated than oils like soybean or palm.
The more linolenic acid (a type of omega-3) an oil has, the more MDA and 4-HHE it makes when heated — these chemicals only show up in oils with this specific fat.
Oils with lots of unsaturated fats, like soybean oil, produce way more toxic chemicals when heated to frying temperatures than oils with more saturated fats.
When you cook oils at high heat, especially above 180°C, they break down and make more harmful chemicals — the hotter it gets, the more chemicals form.
To be safe, don’t heat hemp oil hotter than 190°C or for longer than an hour — this is the advice from the researchers.
Hemp oil already had tiny amounts of certain unhealthy trans fats, but heating it didn’t make any more of them.
Hemp oil is mostly made up of linoleic acid, with smaller amounts of two other healthy fats, and heating doesn’t change which fats are most common.
Hemp oil with garlic or chili added stays fresher longer when heated than plain hemp oil.
Even when you heat hemp seed oil really hot for a long time, it doesn't go bad in a way that makes it unsafe by standard food quality rules.
This study only looked at white adults in the U.S., so we don’t know if the same drop in trans fats happened in Black, Hispanic, or younger people — the results only apply to this group.
Three other types of trans fats found in processed foods also dropped sharply in people’s blood between 2000 and 2009, showing the decline wasn’t just one type — it was a widespread change.
One of the main types of trans fat in people’s blood — called vaccenic acid — dropped by more than half in just nine years, showing that people were eating less of these harmful fats overall.
In 2009, the 'bad' cholesterol levels in white American adults were about 7% lower than they were in 2000, which could mean less risk for heart disease — but other factors might have contributed too.
In the U.S., the amount of harmful fats from processed foods in people’s blood dropped by more than half between 2000 and 2009, likely because food labels and restaurant rules changed to cut down on these fats.
Even though parents felt less anxious after doing sensory activities with their preemie, they didn’t feel significantly more connected to their baby or more confident as parents after six months.
Even if parents don’t do the sensory activities perfectly every day, just doing them during feeding a few times a day still helps them feel less stressed and depressed.
When parents use touch, voice, eye contact, smell, and feeding to connect with their preemie at home for six months, their anxiety and depression stay lower for the whole six months.
Dads who spend time touching, talking to, and looking at their premature babies during feeding feel much less anxious after six months than dads who don’t.
Parents who do gentle sensory activities like touching and talking to their preemie during feeding for six months are much less likely to feel depressed after leaving the hospital.
When parents gently touch, talk to, and look at their premature babies during feeding for six months, it helps both moms and dads feel much less anxious and stressed out.