Imagine you are out to dinner with a friend and the bread arrives at your table. You are not very hungry, but you think, "l'll just have one little piece." A few minutes later, you realize you have eaten three slices before your meal even arrives. What's going on here?
Even though you are not physically hungry, your body gave you the signal to eat. That's the work of three hormones in your body that control hunger -- insulin, ghrelin and leptin. They are important because the way these balance can impact your weight and health.
Insulin
Insulin is made in the pancreas and allows cells to take sugar or glucose from the blood stream to use as energy.
Approximately one-third of the population inherits a resistance to respond properly to insulin, which prompts the pancreas to secrete more insulin if you eat a meal high in refined or "simple" carbohydrates such as white pasta or white bread.
When the insulin does not respond normally -- allowing sugars to enter the cells of the body -- you can experience insulin resistant hunger. Rather than being physically hungry, you might experience it as a "gnawing" desire to eat.
If you consume meals high in refined carbohydrates on a regular basis, that are not balanced with respect to protein and good fat, you may continually crave carbohydrates.
"Just One..."
Think back to the restaurant example with the bread, or perhaps a recent party where you have helped yourself to a few chips, only to find that you ate a good portion of the bowl. Again, even though you were not physically hungry, your body gave you the signal to eat.
In these situations, you know what you are "supposed" to be eating, but your body continues to give you the signal to eat more carbohydrates.
Running on Empty
The more refined carbohydrates you consume, the more your energy levels fluctuate between high and low throughout the day. Consequently, you never truly feel like you are running on real energy.
Not to mention, your body isn't a good ally here. It prefers carbohydrates or glucose as its primary fuel. If you are eating a very high carbohydrate diet, your body will first try to utilize the carbohydrate before tapping into calories from fat or protein.
To make matters worse, you may not tap into your fat stores if you are trying to lose weight. If you continue to a diet high in sugar or simple carbohydrates, your body will prompt you to continue eating these foods, leading to increased hunger and chronic carbohydrate cravings.
Ghrelin Grows and Leptin Lowers
This first thing to know is that ghrelin makes you feel hungry and leptin causes you to feel full. An easy way to distinguish between the two is that ghrelin grows your appetite and leptin lowers it.
They work to your advantage when your diet is in balance and you are receiving adequate sleep. They work to your detriment when your diet is out of balance and you are lacking sleep. Most importantly, the macronutrients you eat -- carbohydrate, protein and fat -- strongly influence them.
Appetite Ups and Downs
David Cummings, M.D., of the University of Washington School of Medicine, has done multiple studies on how macronutrients affect the hunger hormones.
In 2007, he and his colleagues conducted a study that found:
• Proteins were the best suppressors of appetite
• Fats have a neutral affect on appetite
• Carbohydrates initially lowered the appetite, but then rebounded soon afterward with a vengeance -- causing the appetite to be even greater than before the food was introduced.
Sleep and Appetite
In 2004, Eve Van Cauter of the University of Chicago conducted a study to see if sleep deprivation altered appetite. They tested men who slept 4 hours for two consecutive nights followed by 10 hours of sleep for two consecutive nights. They found that after sleeping for 4 hours versus the 10, the men had:
In summary, sleep deprivation not only increases hunger levels, but lowers metabolism, not a good combination for health and weight loss.
How to help your hunger hormones work to your advantage:
1. Have protein at all meals, but especially at breakfast. Breakfast sets the appetite tone for the day so consuming some high-quality protein such as eggs, organic plain yogurt or cottage cheese with some nuts will lower your ghrelin levels and minimize a spike in insulin levels to keep hunger at an even keel throughout the day.
2. Stay away from refined-carbohydrate-only meals and snacks such as cereal, a bowl of pasta, crackers, chips and starchy snacks. Even having a healthy snack such as fruit alone can trigger a spike and a drop in insulin, so add some nuts or a piece of cheese with the fruit.
3. Put ghrelin to rest: Getting adequate rest keeps your ghrelin and leptin levels in check to allow for normal levels of hunger.
Susan is the author of A Recipe for Life by the Doctor's Dietitian. For more information, visit susandopart.com
Follow Susan B. Dopart, M.S., R.D. on Twitter: www.twitter.com/smnutritionist
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"The frequency of insulin resistance is observed to be 3% in the general population; a several-fold increase occurs in individuals with glucose intolerance."
From http://emedicine.medscape.com/article/122501-overview.
Susan Dopart, M.S, R.D.
www.susandopart.com
Susan Dopart, MS, RD
www.susandopart.com
Worse, because the brain senses that a famine has occurred (because it is no longer "hearing" the leptin signals), it slows down the metabolism to conserve energy (including lowering thyroid production). This creates a vicious cycle of lowered energy and increased hunger which create more fat cells that produce more leptin and on and on and on.
As leptin is a protein hormone, you can not boost or support your leptin levels with oral medications as it will break down and become ineffective in the digestive system. Plus, for most people, the problem is too much leptin so don't spend money on the leptin supplements begin sold.
The best you can do is help your leptin work better by eating omega 3 rich foods, lots of fruits and vegetables and exercising most days of the week. Eat real food, not chemically created faux foods. Drink adequate amounts of water and teas and use stevia or xylitol as a sweetener, if you must.
Blessings,
Lynette
Author of Unlock Your Metabolism
So I d just follow ancestral wisdom. You re not getting my cereal breakfeast away. I f I crave sugars, or feel hungry I drink water instead, and relax. Works 100% of time.
Roy Mankovitz, Director
http://www.MontecitoWellness.com
http://web.mit.edu/newsoffice/2004/carbs.html
In my opinion, the authors completely missed the real issues and failed to account for significant confounding variables. My approach would have been as follows: for those with carb cravings, perform stool, saliva, urine and blood tests looking for signs of candidiasis, parasite infestation, and antibodies to gliadin (gluten). Also perform a thyroid panel, including free T3, a saliva cortisol and DHEA panel, check buccal cell magnesium levels, as well as iodine and bromine levels. I would also do a glucose tolerance test in the afternoon time period. I would take a history looking for major antibiotic use in the past, use of the Pill or steroids, a mouth full of metal and root canals, and exposure to environmental toxins.
What you are likely to find is that the carb cravers are toxic waste sites, loaded with fungal and other parasitic infections, causing subclinical hypothyroidism, adrenal insufficiency, hypoglycemia, vitamin and mineral deficiencies, and possibly subclinical celiac disease. When these afflictions are treated properly, the carb cravings miraculously disappear, along with a host of other symptoms.
diet plan. I quote from your site "the need is urgent: medicine doesn’t work, but rocket science does."
I find that statement, yes I reviewed your claims, and find it irresponsible. You can dress-up 'snake oil' but it's still snake oil..........not in my body bub, stick to rockets!
I wish you the best of health.
Doug Lisle wrote a great book about food cravings and how to overcome them as a part of a healthy way of eating. His book is called "The Pleasure Trap".
Dustin Rudolph
www.PursueAHealthyYou.com