The Telegraph article is mainly an advert for Gleeson's book, and contains some dodgy info - eg "your body naturally needs carbohydrates". Naturally he wants to promote exercise, which is what he's selling, and wants to minimise keto or calorie restriction.
The article links to a January 2021 interview with Gary Taubes (who also has a new book out) and this is much more supportive of LCHF than the Gleeson article. Selection below:
Yet public health guidance typically recommends bread, pasta and potatoes. “Starchy food,” says the NHS’s Eatwell Guide, “should make up just over a third of the food we eat.” Guidance along those lines, Taubes says, “is just the wrong advice. It works for lean and healthy people, who, if they follow that advice, will probably remain lean and healthy. But for those of us who are predisposed to get fat, and we are now 50 per cent of the population, that’s the wrong advice. We do that diet and we get fatter, and/or we get hungry. So we’re either going to be fatter, and trying to restrict how much we want to eat all the time, because we’re constantly hungry, or we’re going to eat to satiety and really have a problem with our weight and our blood sugar.”
So why would the NHS and other public health authorities promulgate such a destructive diet? Advocates of low-carb, high-fat argue that this has happened for several reasons. The main one is that people of naturally healthy weights tend to assume that whatever they eat should work for others, too. So in a society in which most people are slim and grain-based diets are cheap and practical, grain-based diets are likely to appear favourable. Based on what was, in Taubes’ view, flimsy evidence, nutritionists such as the charismatic Ancel Keys argued from the 1950s onwards that saturated fat caused heart disease. Food manufacturers used cheap, high-carb products such as corn and wheat, using them to create processed foods that were marketed as low-fat but which exacerbated obesity rather than alleviating it.