A large analysis with 3.5 million participants shows that higher fiber consumption is associated with approximately 23% lower risk of premature death, with similar reductions for cardiovascular disease and cancer. The guideline is 25 to 30 grams of fiber per day, preferably from whole foods such as legumes, vegetables, fruit, and whole grains. This is one of the strongest and most consistent dietary associations known.
The largest analysis in this field, covering 3.5 million participants, shows that people who consistently eat more fibre have roughly a 23% lower chance of dying prematurely, with similar reductions for cardiovascular disease and cancer. That is one of the strongest nutritional associations we know of, and the consistency across dozens of studies makes it plausible that fibre is genuinely doing something here, and that it is not simply a matter of people who happen to live healthier lives.
Most people fall well short of the guideline of 25 to 30 grams per day. To put that in concrete terms: a serving of lentils or chickpeas easily provides 7 to 9 grams, an apple with its skin about 4 grams, and a slice of wholegrain bread 2 to 3 grams. You can get there through ordinary daily choices, without supplements or special products. What the studies measured is fibre from whole foods -- vegetables, fruit, legumes, wholegrains, nuts and seeds -- not fibre powders from a jar.
If you currently eat little fibre, build it up gradually over a few weeks and make sure to drink enough water alongside it. Your gut needs a little time to adjust, otherwise you may experience bloating. Beyond that, there is nothing complicated to manage here: this is one of the simplest and most affordable things you can do for your long-term health.
Strong evidence, based on 1 source(s), including controlled or causal research.