No offense meant, but what doctors believe about breakfast or anything else nutrition-related is irrelevant. They disagree just as much as any other group. NO ONE, supposed expert or otherwise, has a corner on the truth. This is why you need to try different strategies to find what works best FOR YOU. This means not blindly following some arbitrary rules because common "wisdom" says so. I now regret nagging my son to eat early in the morning; he was not hungry and it created a constant negative interaction that was entirely unnecessary. And I used to not even consider if I was actually hungry in the morning, I'd been "told" breakfast was important, and I ate it. That didn't really change (other than "what" I ate) until I started 5.2. It's not that I never eat breakfast now, just that I consider other variables before doing so. For example, I go to a freeform dance on Saturday mornings. I began this well after starting 5.2, and since I hadn't been eating breakfast (just a cup of black coffee), I didn't at first. But dancing full out for 75+ minutes, I found myself getting a bit shaky mid-way. So now I do have a light snack; ideal seems to be a piece of wholegrain toast with almond or peanut butter (with my coffee!), optional a few berries on top (in lieu of jam). And since I do love me some cold cereal, some mornings I might have a bowl.
For those of you who just feel you "must" have something in the morning, you could try the food combining breakfast: (yes, plain coffee or tea is allowed)--Eat ONLY raw fresh fruit till noon. No other limits. It's very cleansing; in fact, even now if I feel I'm trying to come down with a cold, I'll do this. When I was doing this all the time, I just made a big bowl of fruit salad--yum!