Yep - HFCS and the flavor enhancers the industry is putting in our foods are highly addictive. But the addictive nature of the processed foods is not the only reason for our obesity problem: Additionally, the serving sizes, the big plates and glasses are reasons for our weight gain. When is the last time you actually had a 5 oz. glass of juice and a 8 oz. glass of milk? Restaurant serving sizes used to be a lot smaller, less than half what is served nowadays. Furthermore, we do not move anymore and not matter what you do in your daily hour of exercise, it will not make up for a sedentary lifestyle. It's the little activities we do not do anymore that kills our metabolism, such as cooking from scratch, doing dishes, walk the dog, sweep the floors, walk to the stores, typing on the typewriter even, taking the stairs, etc. We sit in front of the computers/TVs/Smart Phones all day, pick up our food without effort on our part, use a voice recognition program to do the typing for us - those things make us fat.
Grains have been around since the beginning of civilization and every time peoples could rely on grains for nutrition, great civilizations developed. People are omnivores: any food in its natural state in moderation. IT IS THE MAN-MADE PROCESSED FOODS THAT IS KILLING US - not whole grain flours or rice.