What is an antioxidant?
In laymen’s terms, antioxidants are substances found in fruits and veggies like blueberries that neutralize free radicals in the body, which can cause disease and health problems.
The more extensive answer is antioxidants help to prevent cell damage from harmful free radicals called oxidants (also called Reactive Oxygen Species or ROS). These are produced naturally in the body (especially when exposed to increased stress) and can also be found in environmental toxins (air pollution, cigarette smoke, alcohol, etc.).
When the body is fighting off microbes and viruses it creates these free radicals, but if they exceed the amount that the body can deal with, then the free radicals can cause damage to the cells. This can contribute to accelerated aging and an overloaded immune system, leading to diseases like heart disease and cancer.
So what can be done to prevent this?
Antioxidants are very beneficial to keep your body feeling and looking healthy and the best way to get them into your system is by eating whole foods that are high in these nutrients (look below for a list of antioxidant rich foods).
Can’t I just take a supplement?
While that seems like the obvious choice, overloading our systems with antioxidant supplements can actually be more harmful. It’s important to maintain an oxidant-antioxidant balance because taking too many antioxidant supplements can turn off the body’s ability to activate its own defense system. [1][2]
There is a growing amount of research suggesting over supplementation can even potentially lead to more disease and faster cancer metastasis (tumor spreading from the primary site of origin to other parts of the body). The activity of a cancer-suppressing gene (P53) gets turned off and thus helps cancer cells grow and spread more rapidly throughout the body. The antioxidants might initially help prevent cellular damage by protecting against tumor formation but once there is a tumor, the same antioxidants may facilitate the malignant behavior of these cancer cells.
Also, many of the popular antioxidant supplements, like glutathione will end up being destroyed in the stomach by enzymes and lactic acid before even reaching the cells and won’t be as effective. Furthermore, many of the antioxidants that have been shown to prevent or decrease the effects of diseases in rat studies have been unable to show the same benefits in human trials [15][30].
What’s the best way of getting the benefits of antioxidants?
The body will best use antioxidants when absorbed through food. Read below about which foods are rich in anti-disease, aging and cancer benefits. It’s important to eat local, organically raised fruits and vegetables (especially cruciferous ones), eggs, and hormone-free, grass-fed meats. Make sure to limit the things that cause oxidative stress, like eating sugar and processed foods, staying up too late, drinking alcohol, smoking cigarettes, and not managing stress well. Most
importantly don't rely on antioxidant supplementation because not only can they be costly, they can potentially facilitate the diseases you are trying to resist.
**As a side note, some of the basic supplements that I often do recommend are Vitamin D, Omega 3’s, and B Vitamins (B-Complex).
Smoothies are a great way to increase antioxidants in your diet. Here is one of my favorite quick and easy recipes:
· 1 cup of hemp or almond milk
· ½ of frozen banana
· ½ avocado
· ¼ cup of fresh or frozen strawberries
· ¼ cup of fresh or frozen blueberries
· 2 tablespoons of chia seeds
· 1 tablespoon of spirulina powder
· 1 teaspoon of maca powder
***Add 1 tablespoon of almond butter for an added boost of protein and healthy fat.
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See below for an extensive list of antioxidants by category and the whole foods that are the best sources.
The six main types of antioxidants are: phytochemicals, vitamins, minerals, enzymes/coenzymes, hormones, and metabolic factors /byproducts. [18]
Phytochemicals can be found in most natural, whole foods and they can be further broken down into 4 main types:
Carotenoids: A vitamins that includes beta-carotene, lycopene, and lutein. Good sources include sweet potatoes, carrots, and dark leafy greens (i.e. kale, spinach, and mustard greens). [3][4]
Flavonoids: Super-antioxidants that can be found in many of the foods that contain vitamin C i.e. strawberries, blueberries, red bell peppers, broccoli, citrus and tropical fruits. Curcumin is a powerful flavonoid found in turmeric root, which has anti-inflammatory and cancer blocking properties. Also, cherries are particularly high in a type of flavonoid called anthocyanins, which according to recent studies, have been shown to decrease the chances of gout attacks when 10 or more are consumed per day. Other research suggests that they can also help to reduce symptoms of osteoarthritis – mainly the pain and stiffness so as to increase function in arthritic joints. [3][5][14]
Polyphenos (which are also a type of flavonoid): This is a very large class of antioxidants, which includes quercetin, lignins, and resveratrol. These can be found in cloves, star anise, cocoa powder, dark chocolate, chestnuts, hazelnuts, coffee, black and green tea, and red wine (pinot noir and cabernet sauvignon are the most antioxidant dense wines because they come from the red grapes with the thickest skins). [3][7][8][9]
Allyl Sulfides: Naturally found in the onion family: garlic, onions, leeks, and shallots. [3][6]
Antioxidant vitamins include vitamins A (beta-carotene), E, C, D, K, and folic acid (B9).
Vitamin A is found in two forms: active vitamin A (fat soluble) and beta-carotene (water soluble). Vitamin A and beta-carotene are important for maintaining a healthy immune system and are vital for eye heath, tissue repair, healthy skin, neurological function and many more. Some sources of vitamin A include animal products like beef, liver, eggs, and butter. [3][10]
Vitamin E is also a fat-soluble vitamin that helps the body repair damaged skin, balance cholesterol, thicken hair, balance hormones, and improve vision. Some of the main sources are almonds, spinach, sweet potato, avocado, and butternut squash. [3][18]
Vitamin C is a water-soluble vitamin that helps maintain healthy skin and collagen formation, boosts immunity, improves gum and teeth health, and helps with circulation and heart heath. Some of the main sources are oranges, red peppers, kale, and broccoli. [3][17]
Vitamin D is a fat-soluble antioxidant vitamin that is essential for healthy bones, a healthy immune system, and has been shown to help fight depression. Aside from getting about 20-25 minutes of direct sun exposure per day, some other good sources of vitamin D include: fatty fish like salmon, trout, and tuna, mushrooms, and egg yolks. [26]
Vitamins K is a fat-soluble antioxidant vitamin that plays a critical role in wound healing by helping our blood clot after our skin gets punctured. It’s also important for bone health. Good sources include: dark green leafy vegetables like kale, spinach, and mustard greens. [25]
Folic acid is part of the B vitamin family of water-soluble vitamins. It is important for many functions including cellular growth and regeneration, red blood cell creation, as well as encouraging normal fetal development. Foods high in folic acid include dark leafy greens, asparagus, broccoli, fruits, beans, peas, lentils, and avocados. [3][16]
Antioxidant minerals are commonly known as essential minerals that we need in our diets. Many of them have antioxidant properties or are necessary to facilitate the antioxidant activity of other compounds. These include copper, manganese, iodine, zinc, selenium, and magnesium. [18]
Copper is an antioxidant trace mineral, which means that we require very little of it to maintain proper health. Its primary role is to help form hemoglobin in red blood cells and collagen for healthy skin. Good sources include lentils, almonds, dark chocolate, and asparagus. [19]
Manganese is another antioxidant trace mineral, which helps promote healthy bone production and helps with collagen formation. Good dietary sources include brown rice, oats, garbanzo beans, and spinach. [20]
Iodine is an essential antioxidant trace mineral that is critical for thyroid function, which affects one’s metabolism, growth and maturation of the body. Some iodine rich foods include: Sea vegetables, eggs, tuna, corn, and raw cheese. [21]
Zinc is an essential antioxidant trace mineral that plays a role in hundreds of enzymatic reactions in the body. It plays a big role in wound healing, synthesis of protein and DNA, perceptions of taste and smell, and can even affect your libido. Zinc-rich foods include: spinach, oysters, grass-fed beef, flax seeds, and kidney beans. [22]
Selenium is an essential antioxidant trace mineral that is vital for a healthy immune system and proper functioning of the thyroid gland. Good sources of selenium include: eggs, raw-milk cheese, mushrooms, chicken, Brazil nuts, and oats. [23]
Magnesium is an essential antioxidant trace mineral that helps maintain heart health, a healthy immune system, and muscle function. Good sources include: almonds, sesame seeds, bananas, cashews, tofu, and pumpkin seeds. [24]
Antioxidant enzymes and coenzymes are compounds that help reactions take place in the body. They include superoxide dismutase (SOD), catalases, coenzyme Q10 (COQ10), and L-carnitine. Others that are known as thiol antioxidants include glutathione (GSH) and alpha lipoic acid (ALA). [18]
Superoxide dismutase (SOD) is an antioxidant that helps protect your cells and is found in every cell of your body. As we age the amount of SOD in our cells decrease so it’s beneficial to fill your diet with nutrients that facilitate the production of SOD. Some of the best food sources include: honeydew, cantaloupe, and cruciferous vegetables (arugula, bok choy, broccoli, cabbage, Brussels sprouts, cauliflower, collard greens, kale, and mustard greens). [3][11][18]
Catalase is an enzyme found in all the cells of the body. It helps to protect the cells against aging and diseases like cancer. Some of the best sources include alfalfa sprouts, avocados, sweet potatoes, fruits, and cruciferous vegetables. [3][13]
Coenzyme Q10 (COQ10) is an oil-soluble antioxidant that's involved with energy production at the cellular level. Certain studies show that quantities tend to decline as we age, which negatively impacts our immune systems and can leave us more susceptible to disease like heart disease, Alzheimer’s, and cancer. Foods rich in COQ10 include: grass-fed beef, free-range chicken, avocados, eggs, pistachio nuts, and broccoli. [27]
L-carnitine is an amino acid derivative antioxidant. It plays a crucial role in the production of energy by transporting fatty acids into your cells mitochondria (the energy converting factory in your cells) and it helps to remove toxic compounds. Although it is used as a weight loss supplement, research has been inconclusive. Good dietary sources include meat and fish. [31]
Glutathione (GSH) is an antioxidant that plays several important roles in the body. It is found within the cell and helps keep a healthy immune system. It acts as a co-factor for important enzymes like glutathione peroxidase (which helps protect the cell from oxidative damage), helps the liver detoxify fat before bile is emitted, protect against cancer as well as environmental toxins. Some of the best food sources include milk thistle (also milk thistle tea, can help protect the liver from toxicity when alcohol is consumed), whey protein, and cruciferous vegetables. [3][12][18][27]
Alpha Lipoic Acid (ALA) is an antioxidant that is both water and oil-soluble, which allows it to help repair other antioxidants inside the cells or in the outer membrane. It helps increase glutathione levels, while helping to protect against heart disease and stroke and lower harmful cholesterol (LDL) that leads to atherosclerosis. It also protects against diabetes, preserves eye health and helps prevent memory loss. This antioxidant diminishes as we age so having a diet rich in this is critical. Good sources include: broccoli, spinach, grass-feed beef, Brussels Sprouts, tomatoes, brewers yeast, and beets. [18][27]
Antioxidant hormones help to regulate many different aspects of our body’s growth, nutrient metabolism, thermal regulation, and helps regulate blood sugar. Antioxidant hormones include melatonin and Dehydroepiandrosterone (DHEA). [18]
Melatonin is an antioxidant hormone that is produced in the pineal gland and helps to regulate our sleep cycles. It also helps to regulate other hormones like female reproductive hormones including menstruation and menopause. As we age our pineal gland secretes less and less, which explains why many people develop insomnia as they get older. Some melatonin-rich foods include: pineapples, bananas, oranges, oats, rice, and corn. [18][28]
Dehydroepiandrosterone (DHEA) is an antioxidant steroid hormone that is secreted by the adrenal glands and is very important for lean muscle development, fat burning, bone growth, skin health, and immunity. It is also a precursor to 18 steroid hormones including estrogen and testosterone.
The production of DHEA naturally peaks between ages 20-25 and then declines. Unfortunately, many people in our society see a sharp decline in hormone output because of the fact that our adrenal glands are over worked because of the average American’s over worked and non optimal nutrition and lifestyle. This in turn, leads to adrenal insufficiency or adrenal fatigue, which then makes the adrenals unable to synthesize adequate levels of DHEA and makes for more rapid aging to occur. Good sources include healthy fats like coconut products, avocados, olive oil, nuts and seeds, and fatty fish like salmon. [18][29]
Antioxidant metabolic factors and by products include bilirubin and uric acid.
Bilirubin is a substance found in bile and is produced when the liver breaks down old red blood cells. It helps fight against cell oxidation, especially in the brain.
Uric acid is considered a “waste product,” as it is produced from the natural breakdown of food and the body’s cells, but it is a very important antioxidant, accounting for 60-70% of antioxidant activity. [18][30]
Resources:
[1] @acsifferlin, Alexandra Sifferlin. “The Truth About Antioxidants.” Time, Time, 6 Aug. 2013, healthland.time.com/2013/08/06/the-truth-about-antioxidants/.[
[2] “What Are Antioxidants, Really?” Greatist, 23 Aug. 2016, greatist.com/health/what-are-antioxidants.
[3] “Types of Antioxidants.” Nutrex Hawaii, www.nutrex-hawaii.com/types-of-antioxidants.
[4] “Which Vegetables Are High in Carotenoids?” Healthy Eating | SF Gate, healthyeating.sfgate.com/vegetables-high-carotenoids-2256.html.
[5] “9 Flavonoid-Rich Foods to Fight Alzheimer's, Cancer and Aging.” Juicing for Health, 20 July 2015, juicing-for-health.com/9-flavonoids-rich-foods-you-must-include-in-your-diet.
[6] Bytes, Belly. “Vidalia Onion Spread.” Belly Bytes, www.bellybytes.com/nourish/allyl_sulfides.html.
[7] Mike, Dr. “Top 25 Highest Polyphenol Rich Foods.” Dr. Mike, 22 Aug. 2011, mikeroussell.com/top-25-highest-polyphenol-rich-foods/.
[8] Kahn, M.D. Joel. “10 Best Polyphenol-Rich Superfoods + Why You Should Be Eating Them.” Mindbodygreen, 24 Jan. 2015, www.mindbodygreen.com/0-17145/10-best-polyphenol-rich-superfoods-why-you-should-be-eating-them.html.
[9] “Choosing the Best Red Wine for Health (6 Top Choices).” Healthy - Fit - Smart, 2 Aug. 2017, healthyfitsmart.com/best-red-wine-for-health/.
[10] Axe, Dr. Josh. “Top 10 Vitamin A Foods.” Dr. Axe, 28 Mar. 2017, draxe.com/top-10-vitamin-foods/.
[11] LD, Jill Corleone RDN. “Food Sources of Superoxide Dismutase.” LIVESTRONG.COM, Leaf Group, 21 May 2015, www.livestrong.com/article/535782-food-sources-of-superoxide-dismutase/.
[12] Boldt, Ethan. “9 Ways to Boost Glutathione.” Dr. Axe, 21 June 2017, draxe.com/glutathione/.
[13] “What Foods Have Catalase to Reverse Grey Hair?” LEAFtv, www.leaf.tv/articles/what-foods-have-catalase-to-reverse-grey-hair/.
[14] How Cherries Help Fight Arthritis.” Living With Arthritis, 16 Feb. 2016, blog.arthritis.org/living-with-arthritis/arthritis-diet-cherries/.
[15] Moyer, Melinda Wenner. “Antioxidants May Make Cancer Worse.” Scientific American, www.scientificamerican.com/article/antioxidants-may-make-cancer-worse/.
[16] Dr. Edward Group DC, NP, DACBN, DCBCN, DABFM. “15 Foods High in Folic Acid.”Dr. Group's Healthy Living Articles, Global Healing Center, Inc, 19 Nov. 2015, www.globalhealingcenter.com/natural-health/folic-acid-foods/.
[17] Axe, Dr. Josh. “Top 10 Vitamin C Foods.” Dr. Axe, 28 Mar. 2017, draxe.com/top-10-vitamin-c-foods/.[18] Axe, Dr. Josh. “Top 10 Vitamin E Rich Foods.” Dr. Axe, 28 Mar. 2017, draxe.com/top-10-vitamin-e-rich-foods/.
[18] “The Ultimate Guide to Antioxidants: Types, Food Sources & Supplements.” Fitness Edge, fitnessedge.net/antioxidants/.
[19] Axe, Dr. Josh. “Top 10 Copper Rich Foods.” Dr. Axe, 29 Mar. 2017, draxe.com/top-10-copper-rich-foods/.
[20] Manganese, www.whfoods.com/genpage.php?tname=nutrient&dbid=77.
[21] Babcock, Jillian. “Are You Eating Enough Iodine-Rich Foods?” Dr. Axe, 21 June 2017, draxe.com/iodine-rich-foods/.
[22] “26 Foods High in Zinc for Overall Good Health.” Bembu, bembu.com/foods-high-in-zinc/.
[23] Vineetha. “20 Selenium Rich Foods You Should Include In Your Diet.” Health Beckon, www.healthbeckon.com/selenium-rich-foods/.
[24] Axe, Dr. Josh. “Top 10 Magnesium Rich Foods Plus Proven Benefits.” Dr. Axe, 2 Aug. 2017, draxe.com/magnesium-deficient-top-10-magnesium-rich-foods-must-eating/.
[25] Vitamin K, www.whfoods.com/genpage.php?tname=nutrient&dbid=112.
[26]The World's Healthiest Foods, www.whfoods.com/genpage.php?pfriendly=1&tname=nutrient&dbid=112.
[27]“The Trusted Source for Natural Health Solutions.” Vitality - Toronto's Monthly Wellness Journal, vitalitymagazine.com/article/top-five-network-antioxidants/.
[28] “8 Foods to Naturally Increase Melatonin for Better Sleep.” Natural Society, 7 May 2014, naturalsociety.com/8-foods-naturally-increase-melatonin-sleep/.
[29] “10 Tips to Boost DHEA Levels.” Supercharge Your Health, drjockers.com/10-tips-boost-dhea-levels/.
[30] “All About Antioxidants | Paleo Leap.” Paleo Leap | Paleo Diet Recipes & Tips, 18 Jan. 2015, paleoleap.com/all-about-antioxidants/.
[31] “L-Carnitine - A Review of Benefits, Side Effects and Dosage.” Healthline, Healthline Media, 20 Aug. 2016, www.healthline.com/nutrition/l-carnitine.