WEIGHTLOSS

Their Healing Power: Phytochemicals!

Personally, I consider oranges a fruit with superpowers! In a 2020 study, these superpowers were deemed to have originated from a wide variety of phytonutrient compounds which the fruits contain in ample proportion. These phytonutrients include citrus flavanones (types of flavonoids that include the molecules hesperidin and naringenin), anthocyanins, hydroxycinnamic acids, and a variety of polyphenols. When these phytonutrients are studied in relation to oranges’ vitamin C content, the significant antioxidant properties of this fruit are understandable.

A Glass of Orange Juice More Protective than Vitamin C Pills Alone

A study by Italian researchers in the Division of Human Nutrition at the University of Milan, Italy showed that consuming vitamin C supplements do not provide the same protective benefits as drinking a glass of orange juice. According to lead researcher Serena Guarnieri, “It appears that vitamin C is not the only chemical responsible for antioxidant protection.” Further, in oranges vitamin C is only part of a healthful matrix which includes many beneficial phytochemicals (such as cyanidin-3-glucoside, flavanones and carotenoids). These compounds often function synergistically to provide the optimal and most complete benefit to your cells. Owing to the multitude of vitamin C’s health benefits, it is not surprising that research has shown that consumption of vegetables and fruits high in this nutrient is associated with a reduced risk of death from all causes including heart disease, stroke and cancer.

Protection against Cardiovascular Disease

The World Health Organization’s draft report, “Diet, Nutrition and the Prevention of Chronic Disease” concludes that a diet that features citrus fruits also offers protection against cardiovascular disease due to folate, which is necessary for lowering levels of the cardiovascular risk factor homocysteine; their potassium which helps lower blood pressure, protecting against stroke and cardiac arrhythmias; and the vitamin C, carotenoids and flavonoids found in citrus fruits, all of which have been identified as having protective cardiovascular effects. Free radicals also oxidize cholesterol. Only after being oxidized does cholesterol stick to the artery walls, building up in plaques that may eventually grow large enough to impede or fully block blood flow, or rupture to cause a heart attack or stroke. Since vitamin C can neutralize free radicals, it can help prevent the oxidation of cholesterol. Vitamin C, which is also vital for the proper function of a healthy immune system, is good for preventing colds and may be helpful in preventing recurrent ear infections.

Possible Cholesterol-Lowering Benefits

Lab tests indicate that human liver cells produce less apo B when exposed to limonin. Apo B is a structural protein that is part of the LDL cholesterol molecule and is needed for LDL production, transport and binding. Therefore, higher levels of apo B translates to higher levels of LDL cholesterol. Arguably, the most important flavanone in oranges, herperidin, has been shown to lower high blood pressure as well as cholesterol in animal studies. Hesperidin has also been shown to have strong anti-inflammatory properties. Importantly, most of this phytonutrient is found in the peel and inner white pulp of the orange rather than in its liquid orange center, so this beneficial compound is often excluded by the processing of oranges into juice.

Compounds in Orange Peel May Lower Cholesterol as Effectively as Statin Drugs

A class of compounds found in citrus fruit peels called polymethoxylated flavones (PMFs) have the potential to lower cholesterol more effectively than some prescription drugs, and without side effects, according to a study by U.S. and Canadian researchers that was published in the Journal of Agricultural and Food Chemistry. Although a variety of citrus fruits contain PMFs, the most common PMFs, tangeretin and nobiletin, are found in the peels of tangerines and oranges. Juices of these fruits also contain PMFs, but in much smaller amounts. In fact, you’d have to drink about 20 glasses of juice each day to receive an amount of PMFs comparable in humans to that given to the animals. However, grating a tablespoon or so of the peel from a well-scrubbed organic tangerine or orange each day and using it to flavor tea, salads, salad dressings, yogurt or even rice may be a practical way of achieving some cholesterol-lowering benefits.

The researchers are currently exploring the mechanism of action by which PMFs lower cholesterol. Based on early results in cell and animal studies, they suspect that PMFs work like statin drugs, by inhibiting the synthesis of cholesterol and triglycerides inside the liver.

A Very Good Source of Fiber

Oranges’ health benefits continue with their fiber, which has been shown to reduce high cholesterol levels thus helping to prevent atherosclerosis. Fiber can also help out by keeping blood sugar levels under control, which may help explain why oranges can be a very healthy snack for people with diabetes. In addition, the natural fruit sugar in oranges, fructose, can help to keep blood sugar levels from rising too high after eating. The fiber in oranges can grab cancer-causing chemicals and keep them away from cells of the colon, providing yet another line of protection from colon cancer. And the fiber in oranges may be helpful for reducing the uncomfortable constipation or diarrhea in those suffering from irritable bowel syndrome. In addition to oranges’ phytonutrients, vitamin C, and fiber, they are a good source of folate, vitamin A (in the form of carotenoids), vitamin B1, potassium, copper, pantothenic acid, and calcium.

Prevent Kidney Stones

Want to reduce your risk of calcium oxalate kidney stones? Drink some orange juice! A study published in the British Journal of Nutrition found that when women drank 1/2 to 1 liter of orange, grapefruit or apple juice daily, their urinary pH value and citric acid excretion increased, significantly dropping their risk of forming calcium oxalate stones.

Help Prevent Ulcers and Reduce Risk for Stomach Cancer

An orange a day may help keep ulcers away, according to a study published in the Journal of the American College of Nutrition. Researchers are uncertain whether H. pylori lowers blood levels of vitamin C or if high blood levels of vitamin C help protect against infection—either way, eating an orange or drinking a glass of orange juice each day may help prevent gastric ulcers.

Role in Diabetes

Oranges are high in fiber, which can help lower blood sugar levels in people with type 1 diabetes and improve blood sugar, lipids and insulin levels in people with type 2 diabetes. The American Diabetes Association lists oranges, along with other citrus fruits, as a superfood for people with diabetes.

Digestion and weight loss

Oranges are high in fiber, which aids in digestion by keeping you regular. It is also good for weight loss. Oranges are a low-fat, nutrient-rich food with a low glycemic index, which make it an ideal food to consume to protect against obesity, which can lead to other diseases such as heart disease, cancer, diabetes, high blood pressure and stroke.

Oranges and Vision

Oranges are vitamin A rich. This nutrient contains carotenoid compounds like lutein, beta-carotene and zeaxanthin, which can help prevent age-related macular degeneration, an incurable condition that blurs central vision. Vitamin A also helps your eyes absorb light, and it improves night vision. Furthermore, the American Optometric Association reports that vitamin C can help reduce the risk of cataracts and may slow the progression of macular degeneration.

Dangers of Consuming too Many Oranges:

Oranges are great for you, but you should enjoy them in moderation. When eaten in excess, the greater fiber content can effect digestion, causing abdominal cramps and lead to diarrhea.

Furthermore, although oranges are relatively low in calories, eating several of the fruits in a day can add up and may lead to weight gain. It is also possible to have too much vitamin C (more than 2,000 mg a day). An excess of this nutrient may lead to diarrhea, nausea, vomiting, heartburn, bloating or cramps, headaches, insomnia, or kidney stones.

Because they are a high-acid food, oranges can contribute to heartburn, especially for those who already suffer [from heartburn] regularly. People with gastroesophageal reflux disease (GERD, also called acid reflux disease) may experience heartburn or regurgitation if they eat too many oranges.

People who are taking beta-blockers should be careful not to consume too many oranges. These medicines increase potassium levels and, if mixed with too many potassium-rich foods like oranges and bananas, can lead to an excess of potassium in the body. This is a significant concern for people whose kidneys are not fully functional, as the additional potassium will not be effectively removed from the body.

A Quick Serving Idea

Healthy sauté onions and ginger, and then deglaze the pan with orange juice. Use this liquid as a sauce for salmon or tuna.

Practical Tip: For the best DNA protection, skip the vitamin C—fortified bottled drinks and enjoy a glass of real (preferably organic as organic foods have been shown to contain higher amounts of phytonutrients), freshly squeezed orange juice—or simply eat an orange!