It's not that they don't regulate personal choices, it's that regulation makes it such that it can be hard to avoid fallout from some of their bad policies. It can make it more difficult to make good personal choices.  For instance, I've been low carb high protein for years. You never realize how much sugar and corn syrup is in everything until you start trying to avoid it. It's hard to find beef jerky that isn't loaded with corn syrup. It's hard to find canned soup that isn't loaded.  Why is everything loaded? Because the government significantly subsidizes corn, making the ingredient a cheap filler. Unfortunately, it spikes your blood sugar and increases your body's insulin release, leading to insulin resistance and increased hunger.  People are responsible for their own diet and choices, but government policy really does create an environment that enables and encourages fatties to fat.