Functional Foods...Back to the Future
One of the first questions asked in my college biochemistry class was "What is the difference between a drug and a poison?" Many answers were offered...but only one was correct, "the dose." After years of working with herbs and their regulatory status as dietary ingredients, another question arose, "What then is the difference between a food and a medicine?" There is no easy answer, even as this question becomes more pertinent with the explosion of functional foods.
In herbal medicine, often it is a plant's defensive or secondary compounds that make it useful therapeutically. These same secondary compounds also often make exotic foods unpalatable for mainstream tastes. However, as the functional food area grows, nature's bounty of traditionally used exotic foods will be a treasure chest for new product development.
Untapped Exotic Ingredients
Today, the functional food market is held back by issues that will determine how the blurring of foods and dietary supplements is regulated. The question of an herb's GRAS status has come to the forefront. Although there are experts who have sided with the Center for Science in the Public Interest (CSPI), like Dr. Varro Tyler who believe herbs are medicines and should not be regulated as GRAS, other experts take a different view.
For example, author Timothy Johns (Ph.D.) proposes that use of physiologically active herbs has spanned from the origins of the human diet. In his book, With Bitter Herbs They Shall Eat It 1, Johns says "As our species has adapted to the use of plants, plants have become part of our internal ecology." In today's society of milk and honey, he adds "At a time when many people are able to indulge in foods their ancestors usually only wished for, it is clear that we were designed not for the reward, but for the struggle." Basically, we require a more traditional diet, rich in plants with secondary compounds.
Even as mainstream foods increasingly "reward" our palate with high fat, highly refined products, a backlash is occurring in the health food industry that manifests itself in the functional foods arena. The very ingredients that have made exotic foods undesirable for mainstream food development may be ones that make them all-star candidates as functional foods.
Consider the expanding popularity of gourmet lettuce greens. Bland iceberg lettuce had replaced bitter-tasting plants that were once part of more traditional diets. However, as consumers seek more variety, bitter lettuces have been re-popularized. Although not necessarily prized for their health attributes, these lettuces are superior nutritionally and have bitter compounds that may improve our digestion, and make them suitable companions to our daily meals. This is an example of our physiology being designed more for the "struggle" than for the "reward."
Other ingredients that blur the line between foods and dietary supplements include medicinal mushrooms, exotic fruits and roots. (See chart.)
Food as Traditional Medicine
Foods prescribed for health is a basis for traditional medicine systems across the globe. According to traditional Chinese medicine (TCM), the foundation of human health is based on the therapeutic use of foods.
Dr. Ira Goldrechrech, San Rafael, Calif., says that TCM advises the use of certain conventional foods, such as pork and fish, at certain times for human health maintenance. TCM also holds that adding certain herbs to food maintains human health. It could be argued that such herbs, long used in traditional food recipes, might be considered GRAS.
When visiting Laos a few years ago, I was in the field with some agronomists eating a traditional Lao meal. As we ate, a few of the Lao people would pick leaves from a plate of bitter tasting herbs sitting in the center of the table and swallow them along with their food. I was told that the herbs normally accompany meals and are eaten if a need was felt for health enhancement in an area for which the herb was known to be of benefit. None present were medical practitioners, yet they all knew which herb was good for what part of the body. Could these herbs be considered GRAS if the Lao, as part of their meal, have used them for thousands of years?
Sidebar: R&D's Position on Mainstream Nutritionals
While the natural, nutritional products industry looks for opportunities with healthful ingredients in traditional uses outside the U.S., the 2001 Prepared Foods' R&D Survey queried manufacturers on their attitude toward more mainstream ingredients. The following results were obtained when R&D executives at food manufacturing companies were asked, "During the next two years, do you expect the following ingredient to become more or less important to the products for which you have R&D responsibility?"
On February 5, 2001, the FDA issued a letter formalizing its position on foods containing ingredients such as botanicals. (See the site) The FDA expressed its concern that such ingredients are being added to conventional foods, but are not GRAS or approved food additives. An ingredient for functional food development must be either an approved food additive, or a GRAS substance, or one that has a likelihood of being declared GRAS.2 The system of petitioning for GRAS status was modified in 1997 by including a notification process that is self-determining and does not require pre-approval. Companies can decide whether a food or food ingredient is GRAS based on either 1) scientific procedures, or 2) experience based on common use in foods.
With the first route, a company must provide scientific and safety evidence similar to the process for obtaining GRAS status for a food additive. With the second route, however, a company just needs to demonstrate that their ingredient has a substantial history of consumption for food use by a significant number of consumers.
GRAS notices are listed on the FDA website at: http://vm.cfsan.fda.gov/ ~rdb/opa-gras.html. One interesting example is the FDA's response to such a notice, Agency Response Letter GRAS Notice No. GRN 000013. In the letter, the agency responded with "no questions" (a positive response) for chrysanthemum and jellywort because there was "evidence of a history of consumption for food use." The FDA added that it was "aware that both chrysanthemum tea and the product 'Grass Jelly' made from jellywort have been consumed in China for at least one hundred years."
This is where the opportunity exists for product development. There are many "exotic foods" that exhibit functionality that may be determined as GRAS through common use in foods in other cultures. As consumers have been strong supporters of dietary supplements, they are sure to be even stronger supporters of products that exhibit functionality, but yet are as safe as common foods--as shown by centuries of human consumption.
Sidebar: Desperately Seeking Selenium
The typical American diet provides adults with 80 to 150 mcg of selenium per day--less than one half the amount considered optimal for the full protective potential of selenium, especially in cancer prevention. Thus, health professionals increasingly recommend extra dietary selenium supplementation.
In foods, selenium is primarily in the form of L(+) selenomethionine, a highly bioavailable form for both selenium and methionionine, an essential amino acid. In the 1970s, yeast with high selenomethionine levels became available for supplementation purposes. Today, yeast with 1,000 to 2,000 mcg selenium per g is on the market.
For more information on selenium forms, benefits, safety and regulatory status, see www.nutrasolutions.com or type "selenium yeast" in the search field found on the pages of the website.
See also Institut Rosell / Lallemand Inc. at www.lallemand.com.