I have done this whole beat up many a time and just get bloated, on my reviews if you follow them i mentioned that after doing a protein drink 1 hour before then pre, during and after with the training drinks and then a protein drink 30 minutes later is 2.5 ltrs of mainly fillers, colors, heaps of magnesium (shits) and bloat. The best way is some food 1 hour before, make up your own blend of bcaa's or buy Xtend, have some food within 30 minutes and like others have said choose some insulin spike foods. Friend of mine has a mars bar for his spike.
AZZA