The brain – Our most energy-consuming organ. May is the Month of the Brain, our most energy-consuming organs. Representing only 2% of the weight of an adult, the brain consumes 20% of the energy produced by the body.
Glucose, a form of sugar, is the primary source of energy for every cell in the body. Because the brain is so rich in nerve cells, or neurons, it is the most energy-demanding organ, using one-half of all the sugar energy in the body. Although the brain needs glucose, too much of this energy source can be a bad thing.
For more choices to supercharge your brain and sustain you through the day, consider also: avocado, wild salmon, nuts, seeds, coffee, pomegranate, brown rice, tea, chocolate, oysters, olive oil, tuna, garlic, eggs, green leafy vegetables, tomatoes, and cacao nibs.
The human brain has approximately 86 billion neurons. Neurons contain cytoplasm, mitochondria and other organelles. Neurons carry out basic cellular processes such as protein synthesis and energy production.
A healthy brain produces hundreds of neurotransmitters needed for regular maintenance of the brain and needs proteins to do so. But the brain also needs carbohydrates for fuel and other nutrients for repair and maintenance of brain cells. You don't need to load up on protein.
The brain doesn't have a reserve of energy to store away for when it needs it. Unlike muscles, which can store excess carbohydrates, the brain needs to be constantly supplied with oxygen and energy in order to run properly.
Carbohydrates, such as sugar and starch, for example, are readily broken down into glucose, the body's principal energy source. Glucose can be used immediately as fuel, or can be sent to the liver and muscles and stored as glycogen.
In the brain, excess sugar impairs both our cognitive skills and our self-control. For many people, having a little sugar stimulates a craving for more. Sugar has drug-like effects in the reward center of the brain.
One answer may be energy. A ketogenic diet also increases the number of mitochondria, so called “energy factories” in brain cells. A recent study found enhanced expression of genes encoding for mitochondrial enzymes and energy metabolism in the hippocampus, a part of the brain important for learning and memory.
It is well established that the brain uses more energy than any other human organ, accounting for up to 20 percent of the body's total haul. Chen and his colleagues used MRS specifically to track the rate of adenosine triphosphate (ATP) production, the primary source of cellular energy, in rat brains.
Ketogenic diets have been used as treatment for a wide array of disorders. At this point evidence does not suggest that ketogenic diets are harmful to the brain. However, more long-term research needs to be conducted in this area. Ketogenic diets work well for some people while they are hell for others.
Carbohydrates. Even though fats are the most energy-dense of the three energy-yielding nutrients, carbohydrates, which provide four Calories/gram are your body's first choice for energy, especially immediate energy.
The brain is composed of 40% gray and 60% white matter. The gray matter is made up of about 100 billion neurons that gather and transmit signals while the white matter is made of dendrites and axons that the neurons use to transmit signals.
Fat is very important for proper brain function, but it needs to be the right kind of fat. We need to get enough omega 3-fatty acids because these are the essential building blocks of our brain and they're important for learning and memory.
Ketone bodies can be utilized as fuel in the heart, brain and muscle, but not the liver. The brain gets a portion of its fuel requirements from ketone bodies when glucose is less available than normal (e.g., during fasting, strenuous exercise, low carbohydrate, ketogenic diet, and in neonates).
These include headache, fatigue, nausea and so-called “brain fog,” which refers to mental fatigue, hazy thinking and difficulty with concentration and memory. While there has been little research on what, exactly, causes keto flu and brain fog, the symptoms might be the body's response to carb withdrawal.
The dietary guidelines recommend that carbs provide 45 to 65 percent of your daily calorie intake. So if you eat a 2000-calorie diet, you should aim for about 225 to 325 grams of carbs per day. But if you need to lose weight, you will get much faster results eating around 50 to 150 grams of carbs.
A diet low in carbohydrates can cause memory loss, according to researchers. Their study on women aged 22 to 55 showed that those on a low carbohydrate meals suffered impaired memory function after just one week.
Carbs Are Brain Fuel
The body breaks carbohydrates into glucose, which it uses to fuel brain activity. Proteins break down into glycogen, which can also be used for fuel by the brain, but not as efficiently as glucose.The brain typically gets most of its energy from oxygen-dependent metabolism of glucose (i.e., blood sugar), but ketones provide a major alternative source, together with contributions from medium chain fatty acids (caprylic and heptanoic acids), lactate, acetate, and possibly amino acids.
Headaches can be a common side effect of switching to a ketogenic diet. They may occur as a result of consuming fewer carbohydrates, especially sugar. Dehydration and electrolyte imbalances can also cause headaches. See a doctor if headaches persist.
Ketoacidosis. If you have uncontrolled diabetes, ketosis can become dangerous when ketones build up. High levels lead to dehydration and change the chemical balance of your blood. It becomes acidic and can cause a coma or death.
But there could be an unforeseen toll. Because of the way that the human brain functions, low-carbohydrate diets may adversely impact cognitive ability. Since the body most easily creates glucose by metabolizing carbohydrates, it stands to reason that limiting carbohydrates could dampen cognitive function.
To stimulate your brain and increase your mental energy, try these tricks to spark ideas.
- Start using a challenging brain puzzle.
- Read something you don't normally read.
- Arrange a consultation with a really smart person.
- Put the coffee down.
- Go to a brand new place to work for the day.
- Take a brisk walk in the cold.
Most of the cells in your body use glucose along with amino acids (the building blocks of protein) and fats for energy, but it's the main source of fuel for your brain. After your body has used the energy it needs, the leftover glucose is stored in little bundles called glycogen in the liver and muscles.
The National Academy of Sciences recommends consuming at least 130 grams (520 calories) of carbohydrate per day. This is the minimum amount of carbohydrates needed to produce enough glucose for the brain to function.
Cholesterol is found in animal foods. Animal foods include meats, poultry, fish, eggs, and milk products. Cholesterol is a part of your body cells. It helps your body to make certain hormones that you need.
Glucose, a form of sugar, is the primary source of energy for every cell in the body. Because the brain is so rich in nerve cells, or neurons, it is the most energy-demanding organ, using one-half of all the sugar energy in the body. Although the brain needs glucose, too much of this energy source can be a bad thing.
Your brain also needs special materials to run properly: glucose, vitamins, minerals and other essential chemicals. For example, the fuel (energy) for your brain is glucose. You can get glucose by eating carbohydrates or other foods that can be converted to glucose.
Eating smart isn't difficult, but knowing a few basic guidelines can help you choose your foods wisely.
- Go for whole grains. Have a bowl of oatmeal or ready-to-eat whole grain cereal for breakfast.
- Vary your vegetables.
- Focus on fruits.
- Pour in the low-fat dairy.
- Go lean on protein.
