Worth mentioning… Brazil nuts and organ meats (I think) are the two foods you can potentially overdose on with certain vitamins. I can’t imagine anyone ‘snacking’ on liver, but it is possible you could on brazil nuts Brazil nuts contain an insane amount of selenium (rda is in one nut afaik).
In terms of 85-90%, it just gives you a little scope for snacking… across the board drop your amounts in your daily soylent total. this way, if you go over by 20% in some things its no biggie. (it isn’t anyway tbh, unless you do it every day and are close to the upper limits).
The approach I am currently still using (as I wait for my other ingredients to arrive) - I made a pure ‘calories only’ version of soylent. This was to start working on the taste before I spent a load of cash on ingredients (I figured if I can’t get the taste right, its a no go from the start ;)). Anyway, atm I am eating this ‘noob soylent’ once or twice a day, eating some other regular food, and taking a multivitamin. I am going to be below the rda in a few things, but I have been below the rda in quite a lot of things for years, I won’t die (and even doing this interestingly is helping an awful lot in controlling my overeating).
My current basic mix is, sugar, cocoa powder, protein powder, olive oil, dash of salt, water. The olive oil and cocoa powder have some minerals etc in. The multivitamin covers the basics. The other food I eat probably covers a lot of the rest. Now this is only temporary as I say, but there isn’t any reason why you cant do this fairly regularly as say 1 meal replacement if you eat a pretty decent diet otherwise.
The worse your diet, and the more you rely on soylent, the more exact you need to be in the amounts. The danger in soylent comes from 2 areas (imo)
1)You rely very heavily on soylent, and underestimate some of the components needed. Long term this will catch up with you.
2)You go for a fairly complete soylent, or include some non basic elements (e.g. a form of potassium) and screw up in the measuring and give yourself a massive amount.
Making a very basic calorific style soylent as a simple ‘I need calories’ replacement carries no risk other than that you don’t eat enough other stuff to get the rda long term. If you supp with a decent multivitamin, this is even less of a concern.
Regarding calorie consumption… measure the calories in your basic mix, us it as a rough estimate. e.g. your mix has 700 kcals, and you eat it twice, thats 1400, so 600 left to play with for the day.