Is eating organic food really healthier?
Eating organic probably does not give you better nutritional value, but it does lower your exposure to pesticide residues and to antibiotic-resistant bacteria via meat. For pregnant women and young children, that is the most concrete and well-supported argument.
For most nutrients, the differences between organic and conventional food are small and inconsistent, with no clear pattern. Organic dairy and meat contain slightly more omega-3 fatty acids, and organic fruit and vegetables contain somewhat more antioxidants. Researchers consider those differences likely marginal. If you buy organic for the nutritional boost, the science gives you little to stand on.
The strongest argument for going organic is lower exposure to pesticide residues. People who eat organic food have measurably lower pesticide levels in their urine. The chance of detectable residues is around 30% lower with organic products than with conventional ones. Researchers see this as a consistent finding that is likely to reflect a real cause-and-effect relationship.
That pesticide argument carries extra weight for young children and pregnant women. Several large population studies link certain pesticides at current exposure levels to harmful effects on children's brain development. Those findings have not yet been incorporated into official safety standards, which means the risk may be underestimated.
With meat, antibiotic resistance is also a factor. With conventional chicken and pork, the risk of bacteria resistant to three or more antibiotics was 33% higher than with organic products. This difference is considered likely to reflect a real cause-and-effect relationship and is relevant to public health.
Population studies also find links between eating organic and a lower chance of infertility, allergies, metabolic syndrome, and certain cancers such as non-Hodgkin lymphoma. However, people who eat organic often live healthier lives in other ways too: they exercise more and smoke less. This makes it very difficult to isolate the effect of organic food itself, and studies in people that could settle the question are largely lacking.
The claims are based on two large combined analyses and one additional study. The evidence consists largely of population studies and food composition analyses, not experiments in people measuring health outcomes. The strength of evidence for health effects is therefore limited to moderate.
Do you live longer on a vegetarian or plant-based diet?
A good-quality plant-based diet is linked to fewer early deaths. But strictly vegetarian or vegan eating has not been proven to be better than a varied diet that includes occasional meat or fish.
Does eating less help you live longer?
In laboratory animals the effect on lifespan is well established, but in healthy humans direct evidence is lacking. A moderate and sustainable eating pattern is wiser than extreme restriction; discuss major changes to your diet with a dietitian or doctor.
Is fibermaxxing (eating as much fibre as possible) healthy?
Eating more fibre is well supported as healthy for most people, but overdoing it causes gastrointestinal complaints and no additional benefit has been demonstrated. Aim for 25 to 29 grams per day through regular food intake.
Do you actually live longer if you structurally eat fewer calories?
In laboratory animals, eating less convincingly extends lifespan, but this has not yet been demonstrated for healthy people without excess weight. If you want to benefit from what has been shown, eating moderately less or following an interrupted eating pattern are the safest, most reasonably supported options.
Are smoothies and fresh juice just as healthy as whole fruit?
Whole fruit comes out ahead of fruit juice: more fibre, greater satiety, and fewer free sugars. Smoothies fall somewhere in between, but are not equivalent to whole fruit either.
Is eating 800 grams of fruit and vegetables a day healthier than the standard guideline?
More than 400 grams a day helps, but whether 800 grams is clearly healthier than 400 grams depends on your goal: for heart and blood vessel disease there are indications that the benefit continues up to 800 grams, while for lifespan and cancer risk the advantage above five portions is less convincingly shown.