I've noticed some major changes in what we might call 'accepted food truths' in the 14 years that have passed since I took my first diabetes education course,
At the time the three major tenants were:
1. All carbs are equal. It doesn't matter if you eat pure sugar, white rice or beans, a carb is a carb is a carb.
WRONG: Research has resulted in the widespread acceptance of the Glycemic Index, which rates carbs based on how quickly they are absorbed and converted to blood glucose. Good carbs include beans, barley and Uncle Bens Converted Rice, which all have a GI rating below 40. At the top of the bad carb list are table sugar with a rating of 100, and Kellogs Corn Flakes at a whopping 120.
2. You should follow the American food pyramid, which tells you to get well over half your calories from grains including bread and potatoes.
WRONG: This has since been debunked as not scientific facts in the interest of public health but misleading propoganda in support of the agriculture industry.
3. Eat frequent meals, and never skip a main meal or snack.
WRONG: Well, with the newer research referenced in this thread, it looks like this is another myth that may be on its way out.
For professional dieticians tasked with providing advice to the public these must be challenging but interesting times.