If you’re at all, you may have parents or grandparents you remember the basic four food groups. Take a trip back in time with figure 11.22, Courtesy of the US department of agriculture. Joseph I’m coming to you as the department of agriculture introduce the new. But, steps to a healthier you. It turned in 1991 food. Sideways, how did stairs, and named it my peer mid. In 2011, my plate was launched as a more straightforward way to help people remember what to put on their plates figure 11.23b. History can help us understand the recent surge of dietary advice. In the 1960s, studies of food containing saturated fats revealed that participants showed increased serum cholesterol levels. In addition, polyunsaturated fats, found a vegetables and fish, reduce these cluster levels. Back in the 1960s and 70s, the partial hydrogenation of vegetable oils unfortunately also produce trans fats that pose additional Health risks. Other research studies provided dietary advice as well. For example, the Harvard based nurses health study and the health professionals follow-up study track 90,000 women and 50,000 men over several decades. The study revealed that participants risk of heart disease is strong influence by the type of dietary fat consumed. Eating trans fats increase the risk substantially. Although the rise in obesity has been blamed on fat in the diet, the US consumption of calories from fat has decreased since 1980s while the rate of obesity continues to go. All of this would seem to imply that fat is not the culprit it was once believed to be. are Carbs the culprit? Diet books about cobra hydrate and take have spend the sector him from banning all carbs to taking a good converse bad carb approach. The latter claims about carbohydrates cause a quick rise in blood sugar. Insulin is a hormone secreted by the pancreas that allows the cells in your body to absorb and store sugar that is in the blood. The sugar that is not immediately burned for energy is converted to fat and stored in your cells. Glucagon is another hormone secreted by the patriots that has knobs for the fact of insulin. The release of glucagon decreases after a glucose spike, such as results from bad eating habits. Clearly both nutrition and dieting above a complex bit of chemistry!