Because once you start Soylent you cannot possibly stop, or skip a drink and go out and eat with friends? Or cook dinner sometimes? Nonsense.

I'd call a steady diet of fast food a 'food prison'. That's the addictive stuff that ruins your health.

You rally against a false dichotomy and then commit one in almost the same breath. There isn't a choice between a "food prison" of fast food or soylent.

The reality is you should probably choose neither.

Fast food is designed to be addictive (salt/fat/sugar triangle), so the dichotomy is not really false. Its possible to be addicted to fast food. I point to obesity in America and draw some supporting evidence there.

You don't need to point at things there's actually evidence. "Neuroimaging studies in obese subjects provide evidence of altered reward and tolerance." Reward seems to me the most underrated, and extremely powerful form of cognition effecting behavior. https://www.ncbi.nlm.nih.gov/pubmed/21999689

Agreed. Personally, I take supplements as a way to complement my normal diet -- not to substitute it. Once in a while, when it's not possible to have a real food meal, those MRPs can be also very handy.

Although I'd imagine a liquid diet where you are mainly only consuming smoothie type beverages has to be less hard on your digestive system just because of the simply fact it requires less effort to break down?

I don't think "less hard on your digestive system" is an advantage but rather a disadvantage. Just like "less hard on you bones" is not really an advantage for astronauts that spend a couple of weeks/months in space.

If you want to have a healthy body you have to put it under a stress level for which it was designed by evolution. I.e. exercise once in a while and don't just sit in front of your computer, eat enough fibres and harder to digest food, etc

A lot of our digestive flora actually uses "non-digestible" components for sustenance, we're finding. There can be surprising and unexpected side effects to eliminating food components we thought we just excreted. Fiber, for instance, is technically not all digested -- much just passes through -- but it's really important! Other types of fiber are fermented in the gut depending on what bacteria you've got.

Note that Soylent has continually reduced the fiber (and protein!) content of their drink, while increasing non-fiber carbohydrates.

Our bodies having to break down food is not necessarily bad. For example, it allows you to receive a steady stream of nutrients throughout the day, instead of getting it all at once and being deprived later on.

I would be more of the foodie bent, but I love Soylent. You don't have to eat it all the time, just when it's the best way to get your next meal.