There is a suggestion on the Huel bar to consume up to 4 per day. I believe the reason to be that 1 bar provides 25pc of daily fibre so 4 bars will be 100pc. 1 bar is 250 calories so you will be under nourished unless you add extra food to your diet. The main issues appears to be an excess amount of doetary fibre. Other posters have provided good advice regarding the Huel powders. I love the UU although most prefer original flavour or vanilla. Flavours can be added to the original flavour. Experiment with he water and/or milk to adjust the thickness to your taste.