Briefly, Make room, make room is one of the best SF novels I have ever read. It deals with overcrowding and lack of resources and where the continuing expansion in the World population may lead us.
As in that film it centres on Andy Rusch a cop and his elderly friend Sol. Andy falls in love witha yong girl who is about to lose her sugar daddy and persaudes Sol to take her in. Andy is roted in his situtation of having little to eat so greatly that he cannot comprehend a better world and even the lure of the girl being there with him is not enough.
Unlike the film, the food Soylent is neither undesirable nor made from human flesh. It is made from Soya and lentils and people enjoy eating it. When a young kid gets hold of some and intends to sell it, he eats some and cannot beleive how good it is.
A particularly harrowing description is given to a drug trip where the kid thinks dirt tastes sweet and noises sound musical, powerful writing that you won't forget quickly.
This is not a life changing book, I suspect few are, but if you read it you will neither regret it or forget it. Abnd you won't bother with the travesty of a film they made from it again either because next to the book, "Soylent Green" is cheap unwashed pants!