Correct me if I'm wrong, but I was under the impression that a consensus among dieticians and nutritionist has been reached: consume the right number of calorie

Correct me if I'm wrong, but I was under the impression that a consensus among dieticians and nutritionist has been reached: consume the right number of calories, eat less sugar and exercise regularly. The #1 nutrition-related health issue in the U.S. is obesity - a condition caused not so much by what you eat, but by how much you consume. (Bearing in mind that it's easier to overeat when consuming fatty, sugary, calorie-dense foods). If we're talking about dietary recommendations like "eat an antioxidant-rich diet to reduce your chances of developing cancer by %15" - well, I've always considered those to be a little ridiculous. I should modify my otherwise healthy diet in order to slightly tip the odds in my favor for one specific disease? Nonsense.