RE: Refined and unrefined carbs
Jane,
Good points on the glycemic index and insulin surges, but very few people eat only a white flour product alone. Other substances (ie, peanut butter on white bread) slow the digestion process, therefore blunting both the rapid rise in blood sugar and the insulin surge. Additionally, exercise will blunt the insulin response tremendously.
Insulin is also a hormone that facilitates muscle growth, so it isn't a bad guy. And regardless of its tendency towards the facilitation of fat storage, if less calories are taken in than expended, no fat is going to be stored--calories in < calories out=weight loss--first law of thermodynamics again.
I don't argue against eating primarily high fiber,lower glycemic complex carbs, nor do I disagree with your comment regarding spikes in blood sugar leading to an exaggerated insulin response, which, in turn, leads to low blood sugar and the craving for simple carbs to boost blood sugar levels again--when blood sugar bottoms out, the body thinks it's starving and will crave what will give it a big boost in blood sugar again.
My point in all of this is that the diet industry has made people crazy with all the junk science and factoids. The first and formost fact that has to be understood is that if the calories you take in exceed the calories that you expend, you will gain body fat, period. NOTHING changes this basic premise--regardless of the form in which those calories come--"natural" products, pure protein, or M&Ms--if you take in less than you expend, you will NOT gain body fat.
Yes, there are factors to consider as far as satiety, nutrient density, and bodily needs go--fiber makes you feel fuller so you tend to eat less--lower calories in, eating a potato vs a cookie will provide you with more vitamins, minerals, etc, and you have to supply your body with what it needs to function. But people get soooo confused because all these factors are used to manipulate them into believing that the "latest, greatest diet guru" can change the first law of thermodynamics--it ain't gonna happen.
Again, I'm not negating the value of healthy eating--I'm pointing out the fallacy in thinking that as long as a person consumes "healthy" foods, they can eat all they want. Case in point, the low fat trend. There's nothing wrong with eating low fat, but if one assumes that eating fat is all that will make them fat, and that as long as they avoid it, they can eat all they want, they are mistaken--calories DO count! But, from a strictly input vs expenditure standpoint, one could eat nothing but cookies and not gain body fat. They may experience tons of cravings, sugar rushes, blood sugar bottom-outs, but if they keep their calories in equal to or below their calories out, no gain in body fat will occur.
**TO ANYBODY READING THIS--PLEASE UNDERSTAND MY POINT--IT IS TO EMPHASIZE THAT NO FOOD IS BAD AND THAT WHAT COUNTS IN THE FAT LOSS GAME IS FOR YOUR CALORIC INTAKE TO BE LOWER THAN YOUR CALORIC EXPENDITURE. ONCE EVERYBODY HAS THAT FACT LOCKED INTO PLACE, YOU'LL BE ABLE TO DISPELL ALL THE MYTHS AND FACTOIDS.**
Maribeth