Protein shakes are completely off protocol. I was so tired of chicken that I bought some of the JayRobb egg white protein shake that was recommended by people who are using them. I had the most horrible gas and cramps for about 24 hours. Even though it said it was made from egg after I had the problem I looked at the ingredients and it had soy protein which is probably what caused the problem. It was also $20 for 10 servings!
I don't know about the protein bars but my honest recommendation is that you stick to the protocol especially if this is your first round so that you can really know how this works for you. In other rounds if you choose to experiment then you will know if it makes a difference.
The way I got around the gagging from eating chicken was to make a vinaigrette dressing from that recipe book and add some spices to it. It's really sweet (Stevia) and actually made the chicken taste good.
1/4 c. apple cider vinegar
1/2 c. water
2 shakes celery salt
2 shakes onion salt
Ground pepper to taste
20 Drops Clear Stevia
3 packets Stevia
Combine ingredients, pour into jar and refrigerate.
I didn't add the celery or onion salt. I have some Sweet Bell Pepper dip mix that's sugar free and that's what I put in the dressing.