Author: Heather K. Mackie, MS, RD, LD
Week of May 14, 2012
Should You Go Coo Coo for Coconut Water?
By now, I’m sure everyone has heard of coconut water and how it is touted as the “all-natural” electrolyte guru of sports drinks. But what is the truth about coconut water – should one consume or not consume this beverage as a weight loss surgery patient?
Coconut water is often categorized as the fat-free, cholesterol-free, low-calorie, rehydrating, electrolyte-rich drink. With a price tag of around $1.75-2.75 per bottle, are all of these benefits really worth it?
What is Coconut Water Anyways? Coconut water is the clear, nut-flavored, slightly sour juice stored inside young coconuts. It has been a staple beverage of Southeast Asian nations for years, where the fruit is also harvested for its flesh, oil, and milk. This craze first hit the United States about five years ago through two main brands, Vita Coco, which sold $20 million of coconut water in 2009 and Zico, a brand backed by Coca-Cola. According to Merrill Lynch, the US coconut water industry has increased from $0-$35 million in the last five years.
Unlike coconut milk, which is a high-fat emulsion of mature coconut flesh, coconut water is mostly water – about 95% water. Coconut water does contain electrolytes: sodium, potassium, magnesium, calcium, and phosphate, and a small amount of many essential amino acids. Obviously it has gained popularity due to the exclusion of artificial colors and preservatives.
Powerful Potassium. The biggest claim is that this nature’s sports drink is rich in potassium. Below is the average of 3 brands (second chart) of coconut water, which demonstrated a typical serving provides 585 mg of potassium per serving. What are the health benefits of potassium, anyway? How much do you need a day?
Potassium is an electrolyte in the body that is responsible for regulating nerve transmissions, muscle contraction, and heart function. It is also necessary for many enzymes’ activity, including the metabolism of carbohydrates. The adequate intake (AI) for potassium is 4,700 mg/d for both males and females 19 years and older. The AI is established by the Food and Nutrition Board of the US Institute of Medicine. The AI is a recommended intake value based on estimates of nutrient intake by a group of healthy people that are assumed to be adequate. They use an AI when an RDA cannot be established. The AI for potassium was established in 2004 based on an intake that has been found to lower blood pressure, reduce salt sensitivity, and minimize the risk of kidney stones. It is important to note that both potassium and sodium are needed by the body in balance (the body needs more potassium than it does sodium).
Many individuals do not take in enough potassium on a daily basis. This potassium does not have to be supplemented for most individuals; in fact, if the general population consumed more fruits and vegetables, they would see an increase of potassium intake. As we know, most Americans do not consume the recommended amount of fruits and vegetables on a daily basis and therefore, may not take in enough potassium. Let’s take a look at how some fruits and vegetables compare when it comes to potassium amounts per serving:
| Food | Serving Size | Potassium |
| Baked potato, w/ skin | 1 medium | 422 mg |
| Prunes | ½ c | 637 mg |
| Raisins | ½ c | 598 mg |
| Prune juice | 6 fl oz. | 528 mg |
| Lima beans, cooked | ½ c | 485 mg |
| Acorn squash, cooked | ½ c, cubed | 448 mg |
| Banana | 1 medium | 422 mg |
| Spinach, cooked | ½ c | 420 mg |
Below is a chart showing the nutritional value of three commonly found brands of coconut water:
| VitaCoco
100% Pure |
Zico Natural | O.N.E. | |
| Serving Size | 8.5 oz | 14 oz | 11.2 oz |
| Serving/Bottle | 2 | 1 | 1 |
| Calories | 45 | 60 | 60 |
| Fat (g) | 0 | 0 | 0 |
| Saturated Fat (g) | 0 | 0 | 0 |
| Trans Fat (g) | 0 | 0 | 0 |
| Cholesterol (mg) | 0 | 0 | 0 |
| Sodium (mg) | 30 | 160 | 60 |
| Potassium (mg) | 515 | 569 | 670 |
| Carbohydrates (g) | 15 | 13 | 15 |
| Fiber (g) | 0 | 0 | 0 |
| Sugar (g) | 11 | 12 | 14 |
| Protein (g) | 0 | 0 | 1 |
| Calcium | 4% DV | 3% (27 mg) | 4% (40 mg) |
| Phosphorus | 4% | 3% (30 mg) | 2% (17 mg) |
| Vitamin C | 100% | 0 | 0 |
| Magnesium | 10% | 9% (35 mg) | 6% (25 mg) |
Replenishing. Before coconut water came along, many individuals who wanted to replete their potassium levels thought of either bananas (422 mg potassium) or Gatorade (about 53 mg of potassium). While, coconut water clearly has more potassium than bananas I’m not sure that it is truly “healthier.” Eating foods rich in potassium provide other benefits beyond potassium, such as fiber, and many other vitamins and minerals that our bodies need. Eating foods instead of drinking also helps one to feel full whereas beverages don’t make us feel very full for a long period of time.
Also, if you are intending to use coconut water after a workout, you need to replenish more than just potassium. Depending upon the climate, your individual sweat rate, and the type, amount, frequency, and intensity of exercise, it may be just as important to replace sodium losses as well. When we sweat, we lose sodium. In fact we lose more sodium than we lose potassium. However, most people don’t exercise at an intense enough level to require sports recovery drinks. Water is still the best recovery drink for the average person engaging in physical activity. However, if you are the intense training, high-sweat rate exerciser, coconut water still may not be for you. Typically it is recommended that recovery drinks for these types of athletes include higher levels of carbohydrates and sodium. Another common recommendation following an intense workout session for the average adult athlete is to include about 15-17 g of protein and coconut water does not contain even close to this amount of protein.
What Does the Research Say? In one study, eight men exercised in a hot environment until they lost 3% of their body weight and then drank either coconut water, a sports drink, or plain water to rehydrate. All three beverages replenished the men the same. Another study followed 10 men who exercised in the heat for 90 minutes and consumed either water, a sports drink, coconut water, or coconut water with sodium. Two hours later, those who drank the sports drink, coconut water, and coconut water with sodium were slightly better hydrated, which was measured by the amount of body weight regained than those who drank plain water.
What About the Other Electrolytes? We already discussed potassium in great detail, but coconut water also contains four other electrolytes: sodium, magnesium, calcium, and phosphorus. When it comes to sodium, most Americans consume enough of this nutrient and don’t require any additional supplementation unless they are exercising very intensely and losing large amounts of sodium through their sweat. The average sodium content of the three above coconut waters is 83 mg, which is minimal compared to the AI of 1,200-1,500 per day of sodium.
When it comes to magnesium, the average content in coconut water is 31 mg and the Recommended Dietary Allowance (RDA) is 320-420 mg/day and bariatric patients may require this amount or higher. Coconut water provides a very small percentage of one’s daily need of this electrolyte.
The average content of calcium in coconut water is 36 mg and most bariatric patients require about 1,500-2,000 mg/d (or more) of calcium daily to prevent bone loss. This is a very small amount of this nutrient from coconut water.
The last electrolyte discussed is phosphorus (or phosphate) and the average content is 29 mg. The RDA for adults is 700 mg/d and we are still learning more about this nutrient related to bariatric patients. As one can see, coconut water has very small amounts of all other electrolytes (except for potassium) when compared to what an individual needs daily.
What About the Other Claims? As far as other claims related to coconut water, such as anti-aging, improving circulation, fighting viruses, boosting immunity, aiding in kidney health, and reducing the risk of cancer, heart disease, and stroke, there isn’t any scientific evidence to support these such claims in humans. There is some research being performed in test tubes and lab rats at this time suggesting certain plant chemicals found in coconut water may be powerful antioxidants, but any fruit and vegetable we eat also contains antioxidants.
Specifically Related to Bariatric Patients’ Concerns. As we know sugar may sometimes cause problems for some bariatric patients, specifically gastric bypass patients. Coconut water contains about 12 g of sugar per serving, on average. This may be enough to cause dumping syndrome in some patients. Even though coconut water is touted as a low-calorie beverage, many patients can agree they don’t want to consume 60-90 calories on just a beverage when you already have a limited amount of calories to “spend” each day on food. The above referenced numbers are from plain coconut water. The flavored varieties may have even more sugar and calories. If you are really concerned about rehydrating, you might save money by consuming a glass of water and some prunes or raisins.
While there is still much more necessary research when it comes to the magic of coconut water, you have to decide what is right for you and where your priorities lie in terms of reaching your goals. We hope this information is beneficial in helping you to reach a decision and we look forward to CELEBRATING with you as you reach your goals!













