There have been a few journalists who tried living exclusively on Soylent for 2-4 weeks to make a story. They've all had consistent results AFAICT. The taste takes some getting used to. But, most liked it after a week and it's easy to add a bit of vanilla or other flavoring. Once you figure out how much you personally need, you feel energized and not hungry or craving. After a few days, your bowel movements get smaller and less frequent. Your jaw gets sore from lack of activity. Taking up chewing gum is recommended. Eventually, the only major, consistent complaint is the social complications. Eating and drinking with other people is very important. And, it's awkward being the guy at the table with no food on his plate...