Tag Archives: Hunger
DR. C’S JOURNAL: Stress & The Effects Of Cortisol
Cortisol (hydrocortisone, 17-OH-corticosterone) is produced by stress, and is a bad word these days. When I was a practicing allergist, Cortisol worked wonders with asthma, and as a salve helped my patients with eczema.
It functions in the body as a key part of the stress reaction, which preparers the animal body for “Fight or flight”. Cortisone raises the blood pressure, heart rate and blood sugar, and shuts down The immune system, which is not as necessary in times of emergency. It is this last function which helped my patients with asthma and eczema, which are diseases of excessive immune reactivity. You may have heard of the use of dexamethasone( A relative of cortisol ) in severe Covid, which is made worse by an excessive immune response.
Modern life is a pressure cooker, requiring continuous activity and deadlines. The blood Cortisone level, which is raised by stress, is helpful in the short term, but deleterious when persisting over the long term. The prolonged elevation of blood Pressure, blood sugar and heart rate, coupled with a decrease in bone and collagen formation can lead to all kinds of problems including weight gain, diabetes, cardiovascular problems, osteoporosis and mental decline.
Although cortisol in the short term can enhance memory (think of flash – bulb memory), in the long run it decreases hippocampal function, impacting memory.
For these and other reasons, Modern Life makes it desirable to reduce stress and the accompanying elevation of cortisol . Our old friends, Proper sleep, diet and exercise are critical, and help activities such as laughter and yoga to reduce stress. The following reference will cover this in more detail.
DIET STUDIES: HIGH-SUGAR DIETS SUPPRESS DOPAMINE, LEADING TO OVEREATING
From Phys.org/Univ. of Michigan (June 9, 2020):
“On a high-sugar diet, we find that the fruit flies’ dopaminergic neurons are less active, because the high sugar intake decreases the intensity of the sweetness signal that comes from the mouth,” Dus said. “Animals use this feedback from dopamine to make predictions about how rewarding or filling a food will be. In the high-sugar diet flies, this process is broken—they get less dopamine neuron activation and so end up eating more than they need, which over time makes them gain weight.”
It is well known that consuming food and drink high in sugar is not great for us, but scientists are continuing to unravel the intricacies of how the sweet stuff drives negative health outcomes. The latest finding comes from researchers at the University of Michigan, who through studies in fruit flies have found that excess amounts of sugar can shut down crucial neural circuits linked to regulating satiety, possibly leading to overeating in humans.
SUGAR IS A POISON.
A novel illustration of sugars’ lethality was the Georgia sugar refinery explosion in 2008, which killed 14 people. Finely ground sugar is flammable.
Sugar appeared early in civilization, but it was expensive, sparing all but the wealthy of its’ depredations, mainly tooth decay. Only with the post WWII expansion of wealth was it consumed excessively to produce the diseases of overeating. The developed world now consumes over 70 pounds of sugar per person, amounting to over 250 CALORIES PER DAY!
This article shows how SUGAR acts like a DRUG In its INTERFERENCE with the DOPAMINERGIC Reward system. The neurons send less signal, so you need MORE SUGAR to satisfy.
The metabolic systems through which overeating and sugar causes the OBESITY, DIABETES, VASCULAR DISEASE and Early DEMENTIA are convoluted.The best detailed explication is in the NEJM article in intermittent fasting, a healthful practice that is the polar opposite of overeating.
Two very important metabolic mechanisms are discussed, the mTOR system and the Sirtuin system. These systems are important for NUTRIENT SENSING and repair, and conserved in all animals. They worked just fine in our early ancestors.
It seems that primitive man was not blessed (or is it cursed) with easy overabundance or food, and actually spent hours or days in Hunger. When times were good, his body put on muscle, and stored fat against the hard times to come. This is called ANABOLISM. When times were bad, his body went into repair mode, and used the fat for energy. This is called CATABOLISM.
Anabolism has evolved expressly for Young Animals, where extra food is welcome for Growth. After the growing and Reproductive years, our Bodies’ evolutionary “warrant” expires, since the genes it carries have already been spread. Our older bodies are left to deal with machinery more suited to an earlier vibrancy. Our metabolism didn’t evolve to deal with the calories we shove into our aging Bodies. Many mechanisms beneficial in the young prove harmful later on. This divergence has been called “ antagonistic pleiotropy”.
Whatever the explanation, the observation remains: if adults eat more than they can use, they gain weight. With insufficient exercise, this weight is fat. With excessive fat, the joints, blood vessels, liver, heart and brain suffer, and lifespan is shortened.
RETHINK YOUR LIFESTYLE AS SOON AS POSSIBLE. AVOIDING SUGAR, and ALL THINGS CONTAINING SUGAR is as good a place as any to start. You will be rewarded by being able to fully taste and enjoy the natural sweetness of many REAL FOODS, and afforded a longer life to partake in this pleasure.