One thing I find interesting is that the rats lived in an environment where either sweetness always meant additional calories, or sweetness never did (assuming

One thing I find interesting is that the rats lived in an environment where either sweetness always meant additional calories, or sweetness never did (assuming I'm reading the paper right). Which does lead me to wonder: 1. What would happen if sometimes the yogurt was sweetened with sugar, and other times with artificial sweetener? Perhaps at some point the calorie reduction from using artificial sweeteners would balance out the additional calories caused by eating more. 2. And what if the rats started out with regular yogurt, then switched to diet? I imagine there would be an immediate decrease in weight gain - if so, would it stick?