Hi Joelcam,
I use the gym regularly and have not been advised to stay away from the protein shakes - my diabetes dietician, nurse and consultant all know I take the shakes to help with training and are all for them.
I have recently been reducing my carb intake to try to even my levels out. I have noticed a couple of interesting things:
1. I do not have the same energy and intensity at training if I don't have a fairly good carb intake before hand. Have gone from 60g to about 20g and have really noticed the difference.
2. I am actually leaner now having gone from an average of 250g per day to about 170g per day. Those are average figures and are just comfortable levels for me personally. I'm not looking for lo-carb debate, just thought I'd let you know my observations.
Point 1 is the key though... without that fuel, your body cannot be expected to perform at the same level. What do athletes eat before intense sport?... carbs. What do body builders eat when they are ripping? ... protein. When are body builders at their weakest?.... when they're ripping.
My initial conclusion is that protein is great for recovery and building the muscles, but you need to give yourself a decent chance of lifting those weights or running the distance by having a fairly decent carb load before hand.
Sam.