I have no basis beyond my own personal gauge of how I feel and function. I haven’t seen any doctors or done any official tests. But, then again, I never did any before going on Soylent either. Anecdotal feedback so take this for what it is. I thought my experiences with Soylent here could be of interest to someone.
I switched to a ~99% Soylent diet near the beginning of March last year. I stayed as consistent with it as I could. Back then it was Soylent 1.4. After just a week, a week and a half, of nothing but Soylent I felt great! (Aside from some acidic bowel movements but those were quickly resolved by taking the psyllium husk suggestion in these forums) I had more energy, my rests were shorter by much more restful, I had better performance at the gym in my workouts, I felt like I could concentrate better than ever… it was as if I was getting proper nutrition for the first time in my life.
But then the switch to 1.5 happened. It took a while but maybe a month or two before switching to 2.0 when it released, what, a month early? I began to feel more and more lethargic. It was so gradual that I didn’t really realize how bad it was getting. Was my body getting too used to Soylent? Was it some change from 1.4 to 1.5 that wasn’t agreeing with me? I don’t know what happened and I barely noticed, just living day to day doing my thing.
I jumped on the 2.0 train because I loved the idea of the improved convenience it promised. I liked the taste of 1.4 better than 1.5, but 2.0 has definitely been my favorite tasting Soylent. But when it came to how I felt, my energy, my performance physically and mentally, it was still slowly declining. And I still wouldn’t really notice a change until recently because of how gradual it was. The switch from “normal” healthy diet (lean meats, vegetables, no processed foods, water as only drink) to all 1.4 had me feeling amazing for months. With a huge leap the first couple of weeks until it was more gradual. Maybe because my physical and mental performance had improved so it was helping to naturally improve myself further. 1.4 to 1.5 I didn’t notice the change until I started 2.0. First week or two I noticed my performance at the gym was gradually decreasing. Like just before switching to 1.5 I worked my way up to being able to do 12 pull-ups. A personal record! But at the end of 1.5/start of 2.0 I was doing well to get 3 or 4 in. I shrugged it off as just a bad day, everyone has those, but I could never get back, never improve. Then in late November, early December I noticed I was having trouble focusing. I was lucky enough to start a new job the first week of November but I still find it difficult to focus as well as I want to, as well as I remember being able at the height of 1.4.
Mid January I decided I needed to make a change again. I knew my one year experiment I put forth for myself to go all in on Soylent, so see if the calorie and nutritional control would help. It seemed to help very well for a while. But assessing how I’ve been feeling the past few months… lethargic, tired, having difficulty thinking and processing things to the point of taking noticeably long pauses before I speak… I dunno, I feel a far cry form how amazing 1.4 initially had me feeling. I feel as if I’ve slipped backwards so much.
Since the year experiment is nearly over I’ve decided to end my time on Soylent and switch back to a normal diet after I finish my current supply of 2.0. I plan to see a doctor as well just in case it could be something else beyond diet. fingers crossed it’s just the 1.5 and/or 2.0 formula that didn’t agree with me.
Extra note: I supplemented my workouts with post-workout protein and pre-workout BCAAs and all that supplement jazz through cycles just as I did before switching to Soylent.
I’ll still try and keep abreast of the goings ons with the company and product. I believe in them and want to support them, but if turns out it isn’t right for me then it isn’t right for me, yeah?