New to Program. A couple of questions

Hello. I hope I am posting this is the right place. I am trying to figure out the format of the forums.

I am new to the program. I am on step 5. I enjoy healthy food and cooking. So I am looking forward to taking out the white stuff.

My few issues are....1. I eat about a cup of food and am full. If I eat a cup and a half I am stuffed. Then I am hungry again in a few hours. This makes 3 meals a day really hard. That plus I am very active. I do p90x in winter and triathlon in summer. This means I get hungry during and shortly after a workout. My question is do I really need to eat only 3 meals a day? I know the book had a few exceptions, such as a major athletic event. Is a 2 hour tri a major athletic event? I know for some folks this is an easy tri. For me its fairly major.

2. The potato is getting a little difficult to eat nightly. At first I thought, 'great, I like potatoes and I like a bed time snack, this will be a piece of cake (no pun intended). A few days into eating a nightly potato I remembered why I hardly ever buy, cook or order them. I can barely choke down half a small one. And now I am dreading the potato. Can I try some of the alternate suggestions?

Thanks for your help

Laurie