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Brain: Mighty Omega-3s
The health of the brain depends not only on how much (or little) fat you eat but on what kind of fat. Mental performance requires the fat found in fish, known as omega-3 fatty acids.
By: Hara Estroff Marano
We know that the foods we eat affect the body. But they may have even more of an influence on how the brain works—its general tone and level of energy and how it handles tasks. Mood, motivation and mental performance are powerfully influenced by diet.
The brain is an extremely metabolically active organ, making it a very hungry one, and a picky eater at that. It's becoming pretty clear in research labs that the right food, or the natural neurochemicals that they contain, can enhance mental capabilities—help people concentrate, tune sensorimotor skills, keep us motivated, magnify memory, speed reaction times, defuse stress, perhaps even prevent brain aging.
The Right Fats Evidence is accumulating that a diet that draws heavily on fatty food and only lightly on fruits and vegetables isn't just bad for your heart and linked to certain cancers, it may also be a major cause of depression and aggression. Such a diet is particularly common among men.
The health of your brain depends not only on how much (or little) fat you eat but on what kind of fat. Intellectual performance requires the specific type of fat found most commonly in fish, known as omega-3 fatty acids. Even diets that adhere to commonly recommended levels of fats, but the wrong kind, can undermine intelligence. What makes this finding awkward is that certain oils widely touted as healthy for the heart are especially troublesome for the mind.
Omega-3s are known to be particularly crucial constituents of the outer membrane of brain cells. It is through the fat-rich cell membrane that all nerve signals must pass—think of it as a kind of gatekeeper of the mind.
In addition, as learning and memory forge new connections between nerve cells, new membranes must be formed to sheathe them. All brain cell membranes continuously need to refresh themselves with a new supply of fatty acids. A growing amount of research suggests that the omega-3s are best suited for optimal brain function.
Yet, here is one of the central ironies of the American diet: While consuming too much fat overall and too much saturated fat, many North Americans fail to consume enough omega-3s.
Further, the polyunsaturated oils widely recommended as healthful for the heart and widely used in cooking, frying and in prepared foods – corn, safflower and sunflower oils – have almost no omega-3s. Instead they are loaded with omega-6s. You need a proper balance of omega-6 and omega-3 intake for cells to function optimally. Canola oil and walnut oil are highly recommended because of their fat make-up.
Other Nutrients
It's possible to boost alertness, memory and stress resistance by supplying food components that are precursors to important brain neurotransmitters. One of them is choline, the fat-like B vitamin found in eggs.
Studies show that choline supplementation enhances memory and reaction time in animals, especially aging animals. It also enhances memory in people. Choline supplementation also minimizes fatigue. In one study, choline given during a 20-mile run improved running time by a significant amount.
B vitamins influence mood and mental performance. Unfortunately, marginal deficiency in many B vitamins is widespread in North America.
Research has identified other ways to influence mental performance:
- Sugar can make you sharp – although no one can figure out what is the right dose at the right time.
- Carbohydrates – especially when eaten with no protein or fat – may indeed be mentally soothing. Muzak for the mind. There are times when we all need some of that.
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