Antioxidants are substances that protect the body from the harmful effects of free radicals, unstable molecules that can damage cells and contribute to various health problems. While free radicals play a role in important biological processes, an excess of them can lead to conditions like cancer, heart disease, high blood pressure, and diabetes. An antioxidant diet plan, rich in fruits, vegetables, and other antioxidant-containing foods, can help combat these issues and promote overall health.
Understanding Antioxidants
Antioxidants are not a single entity but rather a diverse group of compounds, each with unique properties and benefits. They are found naturally in many foods, particularly fruits and vegetables, and can also be taken as supplements or applied topically in skin-care products.
Some of the most well-known antioxidants include:
- Vitamin C
- Vitamin E
- Vitamin A
- Beta-carotene
- Glutathione
- Coenzyme Q10
- Lipoic acid
- Flavonoids
- Phenols
- Polyphenols
- Phytoestrogens
Antioxidants neutralize free radicals by donating electrons to them, effectively acting as an "off" switch and breaking the chain reaction that can damage cells. The body generates free radicals in response to environmental factors like pollution and as a natural byproduct of normal cellular processes. Because free radicals are unavoidable, an adequate supply of antioxidants is essential to disarm them.
The Power of Food-Based Antioxidants
While supplements might seem like a convenient way to boost antioxidant intake, a varied, healthy diet that includes plenty of colorful fruits and vegetables offers a more comprehensive approach. Foods with antioxidants are generally high in fiber, low in saturated fat and cholesterol, and full of vitamins and minerals, providing a multitude of health benefits beyond their antioxidant properties.
Read also: The Carnivore Diet and Antioxidant Intake
Plant-based foods are the best source of antioxidants, including fruits, vegetables, whole grains, nuts, seeds, herbs, spices, and even cocoa. Many foods that have antioxidants also have other benefits and naturally have the fiber inulin.
Specific Antioxidants and Their Food Sources
Different foods contain different antioxidant vitamins and minerals, so it's important to eat a variety of foods to get a wide range of these beneficial compounds. A food's color often hints at its antioxidants. Adding foods with different colors can help meet that goal.
- Beta-carotene: Common in orange foods like carrots, sweet potatoes, squash, pumpkin, and apricots. Some green leafy vegetables, such as kale, spinach, and collard greens, also contain high levels of beta-carotene. These vegetables also contain high levels of the antioxidant lutein.
- Lycopene: Found in fruits and vegetables with pink and red or red-orange flesh, such as watermelon, papaya, pink grapefruit, and tomatoes. Approximately 85% of lycopene in most American diets comes from tomatoes and tomato-derived foods. Lycopene in tomatoes is one example. More lycopene is available in cooked tomatoes than raw ones.
- Vitamin A: Comes in three different forms, the best-known being retinol (vitamin A1). High levels of vitamin A are found in foods like carrots, sweet potatoes, egg yolks, liver, and milk.
- Vitamin C: Found in high levels in many fruits and vegetables, as well as in poultry, beef, fish, and some cereals. Vitamin C isn't stored in the body.
- Vitamin E: Plentiful in almonds and also found in broccoli, mangoes, and various oils including corn, soybean, and safflower.
Berries and berry products rank near the top of the antioxidant scale, including blackberries, wild strawberries, and cranberries. Many herbs and spices are high on the list, too.
Fruits and veggies aren't the only foods that add antioxidants to your diet. You can find them in nuts, coffee, and even chocolate.
- Coffee: Coffee beans contain a number of antioxidants, including cafestol, trigonelline, phenols, melanoidins, and quinine.
- Dark chocolate: Contains flavanols, which may help protect the heart. Dark chocolate contains more antioxidants than milk chocolate and white chocolate because it has a higher concentration of cocoa solids and less cocoa butter, milk, sugar, and oil.
- Red wine: Contains the antioxidant resveratrol, which comes from the skin of red grapes. It's also found in peanuts and berries.
- Nuts: Walnuts, pecans, and chestnuts have the highest amount of antioxidants of all tree nuts. Although they're technically legumes, peanuts are also high in antioxidants.
Potential Health Benefits of Antioxidants
Antioxidants have been linked to a variety of potential health benefits, including:
Read also: The Hoxsey Diet
Cancer Prevention
Some research suggests that antioxidants could prevent some of the damage free radicals cause that can lead to cancer. However, there's no scientific evidence that antioxidant supplements work to prevent cancer. More research is needed to determine whether antioxidants from foods can help to reduce cancer risk.
Eye Health
Antioxidants may help to lower the chances of age-related macular degeneration (AMD) by up to 25%. If you already have AMD, they can help you keep more of your vision. Vitamins C and E can lower the chance of cataracts and may also slow the progression of cataracts, letting people maintain better vision longer.
Heart Health
People who eat more fruits and vegetables have lower risks of heart disease and stroke. Early research has shown that antioxidants may be responsible for this benefit. Getting antioxidants from foods may be the secret, but more research is needed to find out if there's a real connection.
Skin Health
The antioxidant vitamins C and E have skin benefits. A vitamin C formula applied to the skin might help improve the appearance of wrinkles, protect skin from ultraviolet ray (UV) damage from the sun when used along with broad-spectrum sunscreen, and make dark spots on the skin less visible. As an ingredient in moisturizer, vitamin E appears to help make skin softer, reduce moisture loss, and protect skin cells from sun damage. An antioxidant-rich diet, with plenty of fruits, veggies, nuts, whole grains, and fatty fish, also promotes healthy skin.
Considerations for Antioxidant Supplements
While antioxidants have loads of potential health benefits, there are a few things to keep in mind about them, particularly if you get yours through supplements. No supplement can match the health effects of a varied, healthy diet that includes plenty of colorful fruits and vegetables.
Read also: Walnut Keto Guide
The FDA doesn't regulate dietary supplements. So you can't be sure whether a supplement is effective, safe, or actually contains what it claims to. Antioxidant supplements haven't been shown to protect against or treat disease, other than specific formulas made for people with macular degeneration. Supplements may not be balanced. For example, eight different forms of vitamin E are found in foods. But supplements usually contain just one form of the vitamin. Antioxidants in high doses could be harmful. While a supplement can help if you're deficient in a certain nutrient, supplements can't make up for an unbalanced diet.
Antioxidant supplements could interact with medicines that you're taking for another condition. For example, if you take a blood thinner, vitamin E supplements could boost your chances of bleeding. If you smoke and you take high doses of beta-carotene, your chances of lung cancer go up. If you take a lot of vitamin E, you have a higher chance of prostate cancer and stroke. It is important to always tell your doctor before taking one, especially if you're pregnant, nursing, or taking medication and talk with your doctor about all the medications and supplements you take.
Impact of Food Processing on Antioxidants
Drying, cooking or freezing foods can affect its level of antioxidants. Sometimes cooking allows an antioxidant to be better absorbed. In addition to cooking, some antioxidants are more available when paired with another nutrient. Other foods with carotenes also may offer more nutrients cooked. Other foods have more antioxidants when raw.
Wider Knowledge of Food Harvesting/Gleaning, Storage, Preservation, Practices, and Cultures
Wider knowledge of food harvesting/gleaning, storage, preservation, practices, and cultures may enhance our potential for healthy eating. Even in Britain in the 1950s food produce was limited by availability, cost and tradition compared to today. Turning the clock back, as Steinkraus (1993) [24] stated, an interaction between man, microbe, and food existed in Paleolithic times [25], some 10,000 years ago before more elaborate farming took place i.e., the time of transition from hunting and gathering with âplant breedingâ programs in Neolithic times. Neolithic crops developed as part of an important advancement in early agriculture (i.e., wild progenitors to emmer wheat, einkorn, barley, flax, chick pea, pea, lentil, bitter vetch), and species of domesticated animals, viz. cows, buffaloes, goats, sheep, and pigs that were no longer lean (change in meat composition) by running from pursuing hunters. Todayâs âMediterranean dietâ comprises vegetables, fruits, seeds, nuts, beans, cereal grains, and starchy food e.g., bread or pasta, olive oil and fish. N-3 fatty acids, components of the Mediterranean diet, affect brain function particularly in neurogenesis and neuroplasticity and have a role to play in cognition, mood, and behavior [27]. The relatively high intake of plant-derived antioxidant foods compared to Northern European and American diets is striking as is the longevity of their inhabitants, e.g., Cretan. It is South America, though not exclusively, with its abundant and diverse plant life that can make a contribution towards anti-inflammatory and healthy foods. It was 35 Ma during late Eocene that South America [28] was isolated from other geostructures originating further back to Gondwanaland and even earlier to the super continent of Pangaea. Land colonization by plants, probably from marine algae, increased the paradoxical life-giving oxygen that could also harm plants and they developed elaborate phyto-signaling mechanisms involving anti-oxidants which also potentially damaged the plant itself: though perhaps not as much as previously thought [29]. Phytoalexins developed to protect plants, as part of a short-term response, often in the form of reactive oxygen species, to an invading pathogen. Climate change threatens food security and alternative crops/foods for human consumption need to be found in lands affected by drought, e.g., tree pods of the genus Prosopis garnered by pre-Columbian humans e.g., in the ABC countries in the form of flour, syrup, alcoholic beverages [32] and latterly fed to animals because of competitive European crops in the market. These foods have significant antioxidant content as would be expected in abiotic stress. Clearly, human survival-age has increased over time and its role in intrinsic causes of death, antagonistic pleiotrophy or programmed death is not yet fully understood. Adequate food, calorific intake, is essential but restricted calorific consumption may increase longevity through weight loss by timing of dietary intake from the Natick studies of Halbergâs group [33].
Dietary Intake, Food Flavor/Color/Aroma, Olfactory Function, Dementia, Alzheimerâs Disease, Food Antioxidants, Human Ecology, Food Industry
The impact of dietary nutrients on the health of persons of all ages is complex and multifactorial, and chemosensory, involving biology, food antioxidants, chronobiology, environment, culture, religion, eating habits, memory loss, intake of natural products and herbal remedies (such as phytoalexins, polyphenols, carotenoids, spices and aromatic herbs, alcoholic and non-alcoholic beverages), commercial and marketing hype, language, interventions (pharmacological and ânon-drugâ), special cuisines, nursing and domestic care (intravenous and tube feeding), primary nutrients like omega-3 fatty acids, (e.g., alpha-linolenic acid) carbohydrates (glucose-monosaccharide-energy), amino acids (tryptophan), vitamins (B12, B6, C) and trace elements. From the biosystems perspective and intervention, it is evident from many clinical trials and meta-analysis lead to the reverse engineering concept of the erstwhile healthy individualâs part of the heart-brain- mind-gut axes as well as their components (e.g., membranes, cerebral vasculature neurones, and oligodendrocytes), astrocytes and metabolomics/ microbiota. These biosystems are important in ameliorating disease onset or progression. From the patient care perspective, several factors (appetite, food appeal, disease severity, tube feeding, social interaction) are important as is the health of the caretaker. Clearly, food must be appealing to the older person in presentation, texture, color [34,35], taste, flavor and aroma [36] provided olfactory function is not impaired [37]. Non-traditional food/herbs may bestow benefits [38]: even then: do the phytochemicals have the same effect when given alone or in combinations with other foodstuff [39]? Flavor comprises the perception of bitterness and sweetness in the mouth. However, dangers exist in ârewardâ centers in the brain, e.g., obesity and metabolic syndrome [40]; though hyperphagia or hunger in patients with dementia, a process that is complex, leads to possible over- or under-eating. Aroma volatiles of fruit, for example, are specific to species and variety. These volatiles may contain aliphatic esters e.g., strawberries [41] (DWW unpublished data, c2003), phenolic compounds (even in alcohol-free wine [42]), and sesquiterpenes, etc. [43]. The palate of an older person will depend on dietary history, chronobiological age [2], disease status and severity- particularly neurodegeneration, or oesophageal cancer, or other related diseases: so an appetizing diet must take cognizance of the consumerâs, masticatory ability [45] and training thereof using mirror neurons (possibly located in the premotor cortex, supplementary motor area, primary somatosensory cortex, and inferior parietal cortex.) and the dining experience [46], even utensil-less [47], and must consider social isolationism. These facets of nutrition choices, notwithstanding socioeconomic restrictions, relating to the health of the older person are now discussed. Cellular meat, viz. cellular agriculture and dietary consumption is beyond the scope of this article; and taste matching of food components in the older person is beyond the expertise of the authors.
Study of food color as an appealing consumer aid to ingestion and dietary sufficiency
Study of food color as an appealing consumer aid to ingestion and dietary sufficiency has probably 4 main threads, viz. evolution (beyond the scope of this review-area of solar energy utilization and photosynthesis; early history [49]); local and global natural regulated food dye usage that obviates the need for potentially harmful synthetic dyes [50], though not infallibly so from a safety viewpoint; and as an associated (chemical structures in their own right or as a result of chemical interaction with other constituents) functional food property with health giving properties; and culinary skills including the colors not only of the food/beverage but the color of the tableware such as plates, glasses, cups, and tablecloth evoking color contrasts which may be translated into âfoodâ appeal/perception [51], just as we can use geometry, spatial configuration can be used to create an illusion of size of plate. Or else we may have âedible provokingâ perfumes or âedible provokingâ hues; perhaps these may work together or in tandem depending on neurodegeneration characteristics. Visual acuity and learning ability may be impaired in cases of deficiency of docosahexaenoic acid and arachidonic acid which are found in the membranes of the brain and retinal cells, as revealed.
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