Diets, Weight Loss, Hunger, and Brain Chemicals
If you’ve ever been on a diet than you know how hard it is staying on one. It takes a lot of will power, fortitude, and discipline, not only to follow a diet, but also to avoid falling into a feeding frenzy that ends in guilt ridden gluttony. But maybe the reason diets often fail isn’t because of weak moral character or a faulty diet plan. Scientists are discovering that certain chemicals in our bodies may help influence our food choices, our moods, and whether we feel hungry or satiated.
Contrary to popular belief, body fat is not just an inert tissue which stores calories. It is a very active organ that secretes hormones and other substances which effect our health and well being. http://www.biggest-loser.net/showthread.php?t=1375
Two of these chemicals whose job it is to help regulate hunger are called Leptin and Ghrelin.
Ghrelin is a hormone secreted by the stomach that affects appetite by making people feel hungry. Ever wonder how it is that your body can tell when it’s getting close to meal time? That’s because levels of ghrelin increase before meals and then decrease after meals. Ghrelin increases hunger by acting on hypothalamic feeding centers in the brain. It also slows down the metabolism so that the body burns less fat, preparing the body to deal with a scarcity of food, say researchers. People who lose weight through dieting have higher amounts of ghrelin, making it much more difficult to keep the weight off. There are however a few solutions that may help to keep ghrelin from wrecking your diet.
Leptin has the opposite affect as ghrelin. Leptin works by decreasing appetite and increasing metabolism. Leptin binds to a portion of the hypothalamus, known as the ’satiety center’, signaling to the brain that the body has had enough to eat. Leptin is produced by fat cells and when fat cells decrease so does leptin. People who are extremely overweight have higher levels of leptin. However their leptin does not stop hunger as expected due to the development of leptin resistance, similar to insulin resistance in diabetics.
Cholecystakinin, CCK, is a peptide hormone released by the small intestine when fat or protein leaves the stomach. CCk stimulates the pancreas and gallbladder to secrete digestive enzymes and bile into the small intestine. It also tells the body to stop eating via the vagus nerve and turns off ghrelin.
Since CCk is released in response to fat, eating some healthy fats will turn off hunger. Eating a handful of nuts such as walnuts or almonds will cause the intestines to secrete CCK and stop hunger in about twenty minutes. CCk causes the pylorus, the opening at the end of the stomach, to shut, causing your stomach to become full and making you feel full in the process.
Dopamine is a neurotransmitter that acts on the brain to regulate feelings of pleasure and reward systems. It also controls our moods, appetite, and energy levels. According to researchers, reduction in dopamine results in addictive behaviors to food and drugs. Overeaters tend to have a shortage of dopamine receptors in their brains. However, scientists are not sure whether the shortage of dopamine is caused by overeating, whether it is inherited, or both. But whatever the cause may be, exercise has been shown to increase the release of dopamine, and to decrease the appetite. Save the sugar cookies for your in-laws and not your waistline.
Serotonin is one of the better known neurotransmitters because of its many functions in the body. Deficiencies of serotonin have been linked to depression, anxiety, aggression, and irregular appetite. Serotonin affects so many metabolic functions that low levels of serotonin is seen by the body as life threatening and leads to feelings of distress.
Lack of exercise, proper nutrition, sleep, and sunlight, result in lower levels of serotonin. Low levels of the horomone serotonin cause the body to crave carbohydrates and sweets. Carbohydrates contain tryptophan, an amino acid used to make serotonin inside the body. You can increase the body’s manufacture of serotonin by eating a diet rich in carbohydrates. And since serotonin is the brain chemical that makes you feel happy and positive, this could explain why people get cravings for carbohydrates. By eating sugar, sweets, and simple carbohydrates, people increase their serotonin levels, leading to carb cravings on a level similar to a drug addict craving heroine.
To correct this problem be certain that your diet includes moderate amounts of complex whole grains, lean meats, and low fat dairy foods. Other foods that contain tryptophan are turkey, bananas, milk, yogurt, eggs, nuts, beans, fish, peanuts, pumpkin seeds, soybeans, sunflower seeds, cheddar and Swiss cheese. Eating several small meals each day consisting of these healthy choices is also helpful for maintaining serotonin levels. Adding fiber, from foods like whole grains and fruit, makes you need fewer calories in your meals while feeling fuller for longer. Light and exercise also increase serotonin, so exercising outdoors would be an ideal combination. http://www.technewsworld.com/story/53431.html
Eating isn’t just about counting calories; it’s also about staying satisfied. The reason that people overeat is because ‘they’re hungry’ and not receiving the nutrients that their body’s need to maintain proper functioning. You should always eat to stay full, not only to hit a specific calorie count. Eat slowly and give your brain time to catch up with your stomach. If you are still hungry after you’ve eaten, than have another portion size serving of a healthy food.
Your moods affect what you eat, just as much as what you eat affects your moods. “Our bodies are designed to fulfill our needs,” Dr. Oz says. “The gut and the brain are the two most closely related organs. So it makes perfect sense that the foods we eat change the way our brains function.”
Dr. Oz says the following cravings could mean you are feeling these moods:
Meat could mean you’re angry
Sweets might be a sign of depression
Ice cream might mean you’re anxious
Salty snacks could mean you’re stressed
Pasta might signal loneliness or sexual frustration
All of the above might mean you’re just a little bit jealous
And the intersection of food and mood doesn’t stop at cravings. It also involves how we can proactively affect our emotions. “If you’re depressed, you should take omega-3 fatty acids, especially women who are having babies,” Dr. Oz says. “That baby sucks all that healthy fat out of your body and you get depressed after you have this beautiful, brilliant wonderful baby.”
So listen to what your body is telling you about the foods you eat. Are you eating because you’re genuinely hungry or because you’re depressed or agitated? Remember that dieting is not about dire deprivation and making sacrifices, but learning how to work with your body’s chemistry and appreciating its complexity. Learn how to tell the difference and let your body chemistry work for you instead of against you when trying to lose weight.