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5 meals a day is 27g per meal. If one of those "meals" is a proton shake that's 4 meals you need to factor for a day. When I first started upping the protein I found Cottage cheese before bed to make up any deficit during the day an easy fix.
Have you worked out your carbs/fats macros and how many calories you're aiming for?
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Its doable without having to eat huge volumes . quark/ cottage cheese/ SKYR is good bang for buck. Seitan has an awful lot of protein in it, though is pretty salty stuff. 4/5 meals will cover 135g easily. Also possible to get a few extra grams in meals across the day with judicious choices of legumes and veg that you eat. Are you adverse to shakes/ supplements ?
How do people make sure they are eating enough protien? 2g per kg of lean mass for me is about 135g for me. Without drinking a couple of protien shakes I find it hard to eat enough.