We were worried about this too. We have always eaten a lot of vege meals although we aren’t vege at all these days. I do think you would have to eat very oddly in the UK to manage to be short of the RDA for protein. After all, it’s in pulses, nuts, seeds, etc. Not sure whether he eats quorn, dairy and eggs. If he does, then you aren’t going to have any problems otherwise, just mix up your proteins within meals to get the most benefits from what you are eating. We found if we aimed for 800 kcal, the rest seemed to take care of itself. We did do lots of checking initially, more to ensure that we were under the 800 kcal and 50g carb limits. But we soon realised that we were, so there’s no point in checking except maybe when you think you have had too little or too much. We have honestly never been hungry and have had no problems sticking to the diet from that point of view. We have had some little blips, and had something we shouldn’t have about twice a week. The losses have still been great. As far as fibre is concerned just pile on the low carb veg onto each plate and that won’t be an issue. It is well worth taking your water intake up as that makes a difference. We have always measured oils in tsp and now weigh every small helping of full fat yog and other dairy products. So the fat intake of our diet has automatically gone up as we have excluded low fat dairy. It honestly just seems to take care of itself within the 800 kcal limits. Try it and see.