People are told that obesity is caused by fast food, so-called junk food, insulin spikes from eating carbs, refined sugar, laziness and being a certain BMI.⁣ ⁣ But none of these things inherently cause obesity because many people eat all of the above and aren’t obese. And because many are classed as obese by their BMI, but only because they have lots of muscle mass.⁣ ⁣ What actually causes obesity is a combination of many underlying complexities. Food availability, social environments, work envi