In the 60s and 70s in the United States there was a real war between sugar and fats, studies were carried out and one side of experts advocated the harm of fats, the other - the harm of sugar. At the time, the main focus was on obesity. And at that time "fats" won out, as a result of which the food began to be defatted. And if fat does not enter the body, then it has nowhere to take energy - and the producers of sweet food received carte blanche. Sugar gives energy, but it is a completely different energy and it gives less to the body than it ultimately takes. Fats and sugar can be roughly compared to finance - it's like accumulating money on a deposit and microcredit. Microcredit (sugar) burns out quickly and then resources are needed to pay off interest (remove by-products). And the deposit (fat) gives a small income, but it is stable.
One Australian even conducted an experiment on himself trying to understand the dangers of sugar. He consumed sugar for about a month in a volume comparable to the average sugar consumption of the population. And measured the effects of sugar on health with the participation of qualified doctors. And he made a film about this experiment, in which, among other things, this war of "sugar" and "fats" is mentioned, or rather the war of corporations that produce sugar-containing products with corporations that allow their products to contain fat.
If interested, the topic of sugar is discussed in detail here: https://holo-system.com/sugar/ and here: https://holo-system.com/tema-saxara-i-ego-vliyaniya-na-nash-organizm /
And the movie about sugar itself can be viewed here: https://www.youtube.com/watch?v=H27birHostk
And I will add that fats are different. There are a lot of fakes, fat simulations now. For example, trans fats do more harm than good. And you still need to figure out which fat is useful and which is harmful. And some palm oil will not give the body what natural butter or linseed oil will give it.
But in general, sugar actually does more harm when abused than fat. And sugar is also addictive, which is why people with weak willpower need to constantly increase the dose ..
It depends for whom, everyone has their own differences in the work of the body, a lot depends on genetics, insulin resistance, and so on.
The fathobia of the 80s, which gave us a "pyramid of healthy eating" is now more and more confident is refuted by modern research, and sugar and its industrial counterparts such as HFCS (high fructose corn syrup) again claim to be the main villain.
Sugar, with long uncontrolled use, badly affects the hormonal system and the appetite becomes impossible to control, and fat has more calories, so both can potentially harm the figure, but the worst thing is that there is a lot of both sugar and fat - due to the cumulative effect, together this is a dangerous mixture. But the side effects of sugar are not limited to just one figure: a whole cluster of diseases is associated with high insulin, which sugar provokes, from polycystic disease to chronic inflammation, not to mention the obvious ones like diabetes.
Fat, again, can be different : Researchers have more or less formed a consensus about artificial trans fats that are really dangerous, so nowadays margarine is rarely found on store shelves, and it was once promoted as a healthy alternative to animal fats with cholesterol.
Sugar has become the main target now is not without good reasons - in the middle of the last century, the industrial process of making various syrups and adding them to food has dropped dramatically and allowed to solve the rather acute social and political pressure on food prices in developed countries. Thanks to this, now you eat sugar without realizing it, in products that are completely harmless at first glance - bread, sauces, and so on. In a conventional, non-eco-conscious supermarket in the US, it's hard to find bread without added sugar right now. Brown crust on burgers - the same sugar