Diets which cut out dairy food could be a “ticking time bomb” for young people’s bone health, a charity is warning. A National Osteoporosis Society survey found a fifth of under 25s are cutting out or reducing dairy in their diet. It said it was concerned many young adults were putting their health at risk by following eating fads. Eliminating milk products entirely can be harmful unless the missed nutrients are replaced, says the society. The charity surveyed 2,000 adults, including 239 under the age of 25 and 339 aged 25-35. Almost 70% of those aged 18-35 year olds were currently or had previously been dieting. One in five 18-25-year-olds said they had cut out or significantly reduced dairy in their diet, although the survey did not find out why. Milk and dairy food, such as cheese and yoghurt, are important sources of calcium for strong bones. The charity’s survey suggests that many young people seek dietary advice from bloggers and vloggers on the internet. Although some of this advice can be good, it’s concerned some people become too restrictive about what they eat. A recent Food Standards Agency survey found that nearly half of 16-24 year olds said they had an intolerance to cow’s milk and dairy products, compared to just 8% of over 75s.