I don't know about the gut microbiome conclusions the article reaches, but if you're type 2 diabetic you're generally overweight and people generally become ove

I don't know about the gut microbiome conclusions the article reaches, but if you're type 2 diabetic you're generally overweight and people generally become overweight because they overconsume carbs, which don't satiate you as much as fats and proteins (i.e., you consume more and more carbs in order to feel full/not hungry). If you start dropping weight you start feeling better because you are fueling your body better, you have more energy, you have a sense of accomplishment from dropping weight, etc. It's not exactly rocket science. I don't think it's a coincidence that high levels of obesity and depression are both extremely high in the United States. If people lifted weights, engaged in cardiovascular activities, and tracked the calories they consumed depression levels would fall off a cliff. You wouldn't put sugar water into your high performance car, but apparently we have no problem consuming absolutely gnarly things regularly.