I think it's a (very real) problem of mental "energy" more than actual time. What you mention of McDonalds has been studied: https://arstechnica.com/science/2

I think it's a (very real) problem of mental "energy" more than actual time. What you mention of McDonalds has been studied: https://arstechnica.com/science/2016/12/junk-food-cravings-are-triggered-by-the-mere-thought-of-being-low-class/ https://arstechnica.com/science/2016/12/junk-food-cravings-a... And also, some studies say that poor people don't have the mental "energy" because everything has to be evaluated against tradeoffs: https://newrepublic.com/article/89377/poverty-escape-psychology-self-control https://newrepublic.com/article/89377/poverty-escape-psychol...