The Importance of Pigments in Dog Food
Researchers have identified hundreds of different individual phytonutrients, and it’s estimated that one day we may know about as many as forty-thousand. The powerful health properties of colorful pigments are thought to play an especially important role in cancer prevention. While the majority of the research on phytonutrients is being done on humans, it’s likely that most of the benefits being demonstrated apply to numerous animal species including domesticated pets, as well. Read on, for a snap-shot of the different pigments found in various color-groups of foods.
Phytonutrients in Foods
Red foods such as tomatoes, pink grapefruit, watermelon and papaya are rich in the antioxidant Lycopene (a carotenoid). In addition to its antioxidant activity, lycopene has been shown to suppress the growth of tumors in both laboratory and animal experiments. Researchers believe that poor communication between cells is one of the causes of the abnormal growth of cells, which may ultimately lead to the development of different kinds of cancer. One of the ways that lycopene may limit tumor growth is by stimulating communication between cells. Most of lycopene’s health benefits are related directly to its antioxidant properties. Lycopene is especially effective at quenching the free radicals that can damage cell membranes.
Purple & reddish fruits and vegetables such as blueberries, cranberries, blackberries, eggplant and plums, contain compounds called Anthocyanins, a class of flavonoids, which have been found to help reduce risk of cancer, stroke and heart disease. Some studies have shown that the consumption of blueberries is linked with improved memory function and healthy aging. More than 300 structurally distinct anthocyanins have been identified in nature. Some anthocyanins have anti-inflammatory properties, and some studies are looking at their role in the inhibition of tumor development as well as in diabetes and ulcer treatment. It’s also thought that anthocyanins possess possible anti-viral and anti-microbial properties.
Dark green foods such as spinach, kale, bok choi and cabbage contain lutein, another free-radical-quenching carotenoid antioxidant, that’s especially important for skin and eye health. Lutein is also present in the yolks of eggs. Dark green foods also tend to be a good source of the B-vitamin folate, which gets its name from the Latin word folium, for leaf. Folate helps produce and maintain new cells. Folate is essential for the formation of DNA and RNA, the building blocks of cells. It also helps to prevent the types of DNA changes within cells that may lead to cancer.
Orange, yellow and green foods like sweet potatoes, carrots, mangoes, spinach and pumpkin (a superfood, and one of the richest-known sources of carotenoids) contain beta carotene, which can be converted by the body into retinol, a bioavailable source of vitamin A. This potent antioxidant is beneficial for eye health, immune system function and a healthy heart. Zeaxanthin, which is also found in yellow and green foods like spinach, collard greens as well as egg yolk, is beneficial for the eyes and immune system. Many beta-carotene rich foods such as oranges, papayas, bell peppers & kiwis also contain vitamin C, which helps to protect cells from free radical damage as well as promoting skin and immune system health.
White fruits and vegetables such as bananas, parsnips, potatoes and garlic take their ‘color’ from pigments called anthoxanthins. These contain health-promoting chemicals such as allicin, which may help lower cholesterol and blood pressure and their role in helping to reduce the risk of stomach cancer and heart disease in humans is under study. Some white foods like potatoes and bananas are also good sources of potassium, needed for nerve and muscle function as well as blood pressure – which in turn is associated with diabetes, kidney failure and Cushings disease.
Isoflavones, which are found in flax, rye and red clover, have been researched extensively for their ability to protect against hormone-dependent cancers, such as breast cancer.
Phytonutrients for Dogs
How colorful a food is, is a key factor in identifying its nutritional integrity, and also provides clues about the level of processing it has undergone. Refined and processed food that has turned brown from extreme heat or high pressure (such as kibble), is missing the colorful, magical phytonutrients that natural whole food ingredients possess – and which a body needs in order to stay truly healthy. In many minimally processed types of dog food like dehydrated or freeze dried, you can still see the pigments and colors of the ingredients and know that the phytonutrients are still intact.
Just because our dogs have been domesticated and live with us in houses, doesn’t mean they’ve somehow lost their innate, physiological need for a varied colorful, healthy whole diet just like their wild counterparts. A simple hike in the back-country will reveal the red and purple-stained scat of coyotes who’ve supplemented their mostly-meat diets with some of the colorful pigmented wild berries that nature provides. Even though meat should make up the majority of a canine’s diet, the value and health benefits of the pigments present in fresh or gently prepared colorful produce, probably shouldn’t be overlooked.
