Sense of smell fades with age

July 21, 2014 by Stacey Burling, The Philadelphia Inquirer

Food can be one of those unexpected flash points of late life. Grandma may say she's never hungry or that the only things that taste good are salty foods such as French fries. Grandpa may lose control over his sweet tooth, living on Tastykakes and ice cream.

The rest of the family worries that poor nutrition will make their elders' already tenuous health even worse and hasten death. So, in frustration and fear, they chide or tempt loved ones to change their habits. Often, they learn what stubborn means.

"It is extremely distressing," said Louisa Miceli, a nurse with the Visiting Nurse Association of Greater Philadelphia who has heard about eating problems in many a home. "Eating is such an emotional thing."

Because metabolism slows and activity declines, it's normal for to want less food. What families may not know is that, as people get older, the way food tastes changes - and not in a good way. While our are one of the few things that hold up fairly well as we age, our sense of smell is what contributes most of what we think of as flavor - herbs and spices, chocolate, vanilla, strawberry, coffee, wine. And that sense falls apart.

According to research by Richard Doty, director of the University of Pennsylvania's Smell and Taste Center, ability to smell peaks by age 40. It's all downhill from there, with the slope growing sharply steeper after 60. Sixty percent of people between 65 and 80 have major olfactory impairment. More than 80 percent do after 80.

Men are more impaired than women, and smokers fare worse than nonsmokers. Alzheimer's and Parkinson's diseases are also associated with problems with sense of smell. Some medications cause trouble, too.

Older people can also have distortions of taste that make everything - even water - taste salty or give foods a sour or , Doty said. In cacosmia, one of the more alarming problems, foods take on a fecal flavor.

In younger people, the sense of smell can be impaired by viruses, head injury, or chemotherapy.

"People don't appreciate how important these senses are until it happens to them or one of their loved ones," Doty said.

Not being able to smell well can be a serious problem, said Ronald DeVere, a neurologist who directs the Smell and Taste Center in Austin, Texas. People may not smell smoke, leaking gas, or spoiled food. If they lose interest in food, they may lose weight, a risk factor for other health problems in the elderly. Smell loss may also contribute to depression if older people curtail social activities that involve food.

Many retirement communities are upgrading food to make it fresher, tastier, trendier, and more attractive to potential customers. But, during interviews with representatives from several companies that house and feed the elderly, officials often seemed only vaguely aware of sensory issues that might affect how residents perceive food.

Chris Loss, a professor in the department of culinary science at the Culinary Institute of America, said the school recently began working on a project to improve food for cancer patients who have had radiation or chemotherapy. He expects the impending wave of aging baby boomers to inspire the food industry to do more research on the special needs of the elderly. "I think seniors have kind of been ignored over the years," he said.

DeVere, who has treated several chefs with in his practice, said he has tried to educate the culinary industry, without much success. "Most people don't think it's a big deal," he said.

What you're able to "taste" when your sense of goes are only the five basic flavors: salty, sweet, bitter, sour, and umami, a savory meaty taste. But subtle differences are gone. This explains the attraction of salt and sugar to the elderly.

"They pour salt and they pour sweet," Devere said. He said many don't even realize they have a problem. Others complain that is tasteless.

"Sweet is probably the thing that is best maintained," said Marcia Pelchat, an expert in sensory psychology at the Monell Chemical Senses Center.

How much to restrict salt and sugar in the elderly is a question for a person's doctor. Some doctors and nursing homes have loosened restrictions, especially for the oldest patients. They have concluded that weight loss in this population is a bigger danger than and cookies.

"At that point in your life, I'm about saying 'yes' more than I say 'no,' " said Elizabeth Kautz, a registered dietitian at Kendal-Crosslands Communities in Kennett Square.

Still, most experts agree that good nutrition still matters.

"You are what you eat, at any age," said Carol Lippa, who studies Alzheimer's disease at Drexel University.

Explore further: Taste and smell dysfunction in childhood cancer survivors

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