Health Claims

When people do flat bench press, the lower part of their chest muscle grows more than the upper part - and this is the opposite of what happens when they do incline bench press.

Quantitative

When people do bench press on an inclined bench, the upper part of their chest muscle swells more than the lower part, showing different responses within the same muscle.

Quantitative

When you do bench press on an incline, the upper part of your chest works harder. But when you do flat bench press, the middle-lower part of your chest works harder instead. Scientists measured this using muscle activity recordings.

Quantitative

When people want to build bigger biceps, they should focus on bicep curls rather than compound movements like pull-ups that work multiple muscle groups at once.

Causal

When you train one specific exercise, you get stronger mainly at that exact exercise - doing bicep curls doesn't make you much better at doing dumbbell rows, and vice versa.

Causal

When men who hadn't trained before did bicep curls (a single-joint exercise) for 8 weeks, their arm muscles grew about 11%. But when they did dumbbell rows (a multi-joint exercise) instead, their muscles only grew about 5%.

Quantitative

When people do different types of weight exercises - ones that move just one joint (like bicep curls) versus ones that move multiple joints (like squats) - the results for building muscle and strength might be different for people who already workout regularly compared to people who don't exercise much.

Descriptive

For beginners, it doesn't really matter whether you do exercises that work one joint (like bicep curls) or multiple joints (like squats) - what matters is what equipment you have, what movements feel natural, what you enjoy, and how much time you have. The muscles will grow about the same either way.

Descriptive

When young men who don't work out start doing arm exercises twice a week for 10 weeks, their biceps get about 6% bigger.

Quantitative

When young men who haven't trained before do arm exercises twice a week for about 2 months, their biceps and related muscles grow by about 6% on average.

Quantitative

If young men who have never weight trained before do bicep curls twice a week for 10 weeks, their arm strength increases by about 12% on average.

Quantitative

If young men who haven't trained before do lat pull-down exercises two times per week for about 2 and a half months, their arm muscles get about 10% stronger.

Quantitative

When young men who haven't trained before do either multi-joint exercises (like curls) or single-joint exercises (like bicep curls) for 10 weeks, their arm muscles grow by about the same amount - there's no meaningful difference between the two types of workouts.

Quantitative

If young men who haven't exercised before do either multi-joint exercises (like pull-ups) or single-joint exercises (like bicep curls) for 10 weeks, their arm strength increases by about the same amount - neither type of exercise is clearly better than the other.

Quantitative

Eating up to one egg per day is perfectly fine for most healthy adults and fits into a balanced diet, according to official US nutrition guidelines.

Descriptive

If you're an adult in the US eating at least 250mg of cholesterol daily, research suggests that adding just 50mg more cholesterol to your diet might increase your risk of dying from any cause by about 7%.

Correlational

In US adults who eat less than 250mg of cholesterol daily, eating a bit more cholesterol seems to be linked to living longer, with each extra 50mg per day associated with about 13% lower risk of dying from any cause.

Correlational

If you already have high blood cholesterol, eating more eggs might increase your death risk, but if your cholesterol is normal, eggs might actually be protective

Correlational

Eating more eggs might shorten men's lives but extend women's lives, according to one study. The same amount of egg consumption has opposite effects on death rates depending on whether you're male or female.

Correlational

Eating foods with cholesterol doesn't seem to make you more likely to die from heart disease, according to a big study that followed thousands of American adults for almost 8 years.

Correlational

Eating more cholesterol might actually be linked to living longer if you eat small amounts (under 250mg daily), but eating lots of cholesterol (250mg or more daily) seems to be linked to a higher risk of dying from any cause.

Correlational

Eating up to one egg each day doesn't seem to make adults more likely to die early or die from heart disease, according to a big study that tracked over 37,000 people for almost 8 years.

Correlational

When researchers combined many studies about eating eggs and heart disease, they found that the results didn't match up well - some studies showed eggs were bad for your heart, others showed they were fine, and this variation was really high.

Descriptive

Eating an extra 300 mg of cholesterol each day—roughly the amount in one egg—might raise your risk of dying from heart disease by about 1.8% over 31 years, which could add up at the population level since Western diets tend to be high in cholesterol.

Quantitative