More than 5 million Americans are living with Alzheimer's. A recent study found dementia care may have cost as much as $200 billion in 2010. This is roughly twice the amount spent on heart disease and triple the cost of treating cancer.
One doctor claims people can prevent Alzheimer's by changing our diets. Neurologist David Perlmutter, author of Grain Brain, says Americans should cut back on carbohydrates, no more than 60 to 80 grams a day.
"For more than 99% of our time on this planet, we were on a high fat, low carbohydrates, virtually gluten-free diet," Perlmutter said.
He said carbohydrates cause blood sugar spikes. A recent study found even small increase in blood sugar increases the risk of dementia. And Type 2 diabetics have double the risk for Alzheimer's.
Another study found the risk of dementia was 42% lower in those consumed a higher fat, lower carbohydrate diet.
Critics say some people may interpret "grain brain" as permission to load up on high-fat meats and dairy.
In a recent study of more than 350,000 people found no link between saturated fat and cardiovascular risk. He said history proves grains aren't meant for our brains.
The doctor's advice: load up on nuts, veggies, olive oil, eggs, wild fish, free-range chicken, grass-fed beef, avocados and some dairy. He said to choose whole milk.
Permutter advises staying away from trans fats, sugars, processed foods and carbohydrates. In addition, he said to consume fruits sparingly and eliminate gluten.