You may know that a Mediterranean diet — rich in fruits, vegetables, olive oil, legumes, whole grains and fish — offers many heart-healthy benefits. But a Mediterranean diet may also benefit your brain.
Studies show people who closely follow a Mediterranean diet are less likely to have Alzheimer's disease than people who don't follow the diet.
Research suggests a Mediterranean diet may:
- Slow cognitive decline in older adults
- Reduce the risk of mild cognitive impairment (MCI) — a transitional stage between the cognitive decline of normal aging and the more-serious memory problems caused by dementia or Alzheimer's disease
- Reduce the risk of MCI progressing into Alzheimer's disease
It's unclear which parts of the Mediterranean diet might protect brain function.
Researchers speculate that making healthy food choices may improve cholesterol and blood sugar levels and overall blood vessel health, which may in turn reduce the risk of MCI or Alzheimer's disease.
Another theory suggests that following a Mediterranean diet may help prevent brain tissue loss associated with Alzheimer's.
But for now it's difficult to say what exactly explains the relationship between following a Mediterranean diet and reducing the risk of Alzheimer's disease. Some research shows that individuals with moderate seafood consumption had fewer Alzheimer's-related changes in their brains among people carrying the apolipoprotein E (APOE e4) gene, which is thought to increase Alzheimer's risk.
But overall, evidence isn't strong enough to show that the Mediterranean diet reduces Alzheimer's disease risk. One issue is that most studies on the effects of diet on dementia are based on dietary questionnaires completed by participants who may have trouble recalling what they ate or have memory problems.
So, one study used a modified food questionnaire developed for use in older adults to address this issue. The study looked at whether following a Mediterranean diet, the Dietary Approaches to Stop Hypertension (DASH) diet designed to treat high blood pressure or a hybrid diet that combined aspects of both diets known as the Mediterranean-
DASH Intervention for Neurodegenerative Delay (MIND) diet could reduce the risk of Alzheimer's disease.
The results showed that people who strictly followed any of the three diets had a lower risk of Alzheimer's disease. Moreover, even modest adoption of the
MIND diet approach, such as eating two vegetable servings a day, two berry servings a week and one fish meal a week, appeared to lower the risk of Alzheimer's disease.
More research and clinical trials are needed to know to what degree a Mediterranean diet prevents Alzheimer's or slows the progression of cognitive decline. Nonetheless, eating a healthy diet is important to stay physically and mentally fit.
(Mayo Clinic, Jonathan Graff-Radford, M.D.)
The heart-healthy Mediterranean diet is a
healthy eating plan based on typical foods and recipes of Mediterranean-style
cooking. Here's how to adopt the Mediterranean diet.
If you're looking for a heart-healthy eating
plan, the Mediterranean diet might be right for you.
The Mediterranean diet incorporates the basics
of healthy eating — plus a splash of flavorful olive oil and perhaps a glass of
red wine — among other components characterizing the traditional cooking style
of countries bordering the Mediterranean Sea.
Most healthy diets include fruits, vegetables,
fish and whole grains, and limit unhealthy fats. While these parts of a healthy
diet are tried-and-true, subtle variations or differences in proportions of
certain foods may make a difference in your risk of heart disease.
Benefits of the
Mediterranean diet
Research has shown that the traditional
Mediterranean diet reduces the risk of heart disease. The diet has been
associated with a lower level of oxidized low-density lipoprotein (LDL)
cholesterol — the "bad" cholesterol that's more likely to build up
deposits in your arteries.
In fact, a meta-analysis of more than 1.5
million healthy adults demonstrated that following a Mediterranean diet was
associated with a reduced risk of cardiovascular mortality as well as overall
mortality.
The Mediterranean diet is also associated with
a reduced incidence of cancer, and Parkinson's and Alzheimer's diseases. Women
who eat a Mediterranean diet supplemented with extra-virgin olive oil and mixed
nuts may have a reduced risk of breast cancer.
For these reasons, most if not all major
scientific organizations encourage healthy adults to adapt a style of eating
like that of the Mediterranean diet for prevention of major chronic diseases.
Key components of the
Mediterranean diet
The Mediterranean diet emphasizes:
·
Eating primarily
plant-based foods, such as fruits and vegetables, whole grains, legumes and
nuts
·
Replacing butter with
healthy fats such as olive oil and canola oil
·
Using herbs and spices
instead of salt to flavor foods
·
Limiting red meat to
no more than a few times a month
·
Eating fish and
poultry at least twice a week
·
Enjoying meals with family
and friends
·
Drinking red wine in
moderation (optional)
·
Getting plenty of
exercise
Fruits, vegetables,
nuts and grains
The Mediterranean diet traditionally includes fruits,
vegetables, pasta and rice. For example, residents of Greece eat very little
red meat and average nine servings a day of antioxidant-rich fruits and
vegetables.
Grains in the Mediterranean region are
typically whole grain and usually contain very few unhealthy trans fats, and
bread is an important part of the diet there. However, throughout the
Mediterranean region, bread is eaten plain or dipped in olive oil — not eaten
with butter or margarine, which contain saturated or trans fats.
Nuts are another part of a healthy
Mediterranean diet. Nuts are high in fat (approximately 80 percent of their
calories come from fat), but most of the fat is not saturated. Because nuts are
high in calories, they should not be eaten in large amounts — generally no more
than a handful a day. Avoid candied or honey-roasted and heavily salted nuts.
Healthy fats
The focus of the Mediterranean diet isn't on
limiting total fat consumption, but rather to make wise choices about the types
of fat you eat. The Mediterranean diet discourages saturated fats and
hydrogenated oils (trans fats), both of which contribute to heart disease.
The Mediterranean diet features olive oil as
the primary source of fat. Olive oil provides monounsaturated fat — a type of
fat that can help reduce LDL cholesterol levels when used in place of
saturated or trans fats.
"Extra-virgin" and "virgin"
olive oils — the least processed forms — also contain the highest levels of the
protective plant compounds that provide antioxidant effects.
Monounsaturated fats and polyunsaturated fats,
such as canola oil and some nuts, contain the beneficial linolenic acid (a type
of omega-3 fatty acid). Omega-3 fatty acids lower triglycerides, decrease blood
clotting, are associated with decreased sudden heart attack, improve the health
of your blood vessels, and help moderate blood pressure.
Fatty fish — such as mackerel, lake trout,
herring, sardines, albacore tuna and salmon — are rich sources of omega-3 fatty
acids. Fish is eaten on a regular basis in the Mediterranean diet.
Wine
The health effects of alcohol have been
debated for many years, and some doctors are reluctant to encourage alcohol
consumption because of the health consequences of excessive drinking.
However, alcohol — in moderation — has been
associated with a reduced risk of heart disease in some research studies.
The Mediterranean diet typically includes a
moderate amount of wine. This means no more than 5 ounces (148 milliliters) of
wine daily for women (or men over age 65), and no more than 10 ounces (296
milliliters) of wine daily for men under age 65.
If you're unable to limit your alcohol intake
to the amounts defined above, if you have a personal or family history of
alcohol abuse, or if you have heart or liver disease, refrain from drinking
wine or any other alcohol.
Putting it all
together
The Mediterranean diet is a delicious and
healthy way to eat. Many people who switch to this style of eating say they'll
never eat any other way. Here are some specific steps to get you started:
·
Eat
your veggies and fruits — and switch to whole grains.An abundance and variety of plant foods should
make up the majority of your meals. Strive for seven to 10 servings a day of
veggies and fruits. Switch to whole-grain bread and cereal, and begin to eat
more whole-grain rice and pasta products.
·
Go
nuts. Keep almonds,
cashews, pistachios and walnuts on hand for a quick snack. Choose natural
peanut butter, rather than the kind with hydrogenated fat added. Try tahini
(blended sesame seeds) as a dip or spread for bread.
·
Pass
on the butter. Try olive or
canola oil as a healthy replacement for butter or margarine. Use it in cooking.
Dip bread in flavored olive oil or lightly spread it on whole-grain bread for a
tasty alternative to butter. Or try tahini as a dip or spread.
·
Spice
it up. Herbs and spices
make food tasty and are also rich in health-promoting substances. Season your
meals with herbs and spices rather than salt.
·
Go
fish. Eat fish once or
twice a week. Fresh or water-packed tuna, salmon, trout, mackerel and herring
are healthy choices. Grilled fish tastes good and requires little cleanup.
Avoid fried fish, unless it's sauteed in a small amount of canola oil.
·
Rein
in the red meat. Substitute fish
and poultry for red meat. When eaten, make sure it's lean and keep portions
small (about the size of a deck of cards). Also avoid sausage, bacon and other
high-fat meats.
·
Choose
low-fat dairy. Limit higher fat
dairy products such as whole or 2 percent milk, cheese and ice cream. Switch to
skim milk, fat-free yogurt and low-fat cheese.
·
Raise
a glass to healthy eating. If
it's OK with your doctor, have a glass of wine at dinner. If you don't drink
alcohol, you don't need to start. Drinking purple grape juice may be an
alternative to wine.