No I had that problem when I was getting around 100g, now getting over 200g per day. Wouldn't instantly start eating that much, just need to find what works for you. I wouldn't eat that much tuna in a day though... Presume that's 2 tins? I found 2 tins made me go all silly (mercury does weird stuff to your brain) so limit it to 1 tin and only on gym days. Other than a multivitamin, cod liver oil and vitamin C tablets, nope nothing at all. I tried protein shakes before but don't think I can absorb them very well because they didn't do much for the soreness in the following few days. It just sorted itself out when I decided to get more serious about weightlifting and sorted my diet out.