3 reasons why coconut milk may not be your friendUpdate: 10/9/2015
3 reasons why coconut milk may not be your friend
Coconut milk is often a staple fat source for those following a Paleo diet. From a nutritional perspective, it’s an excellent choice. It’s high in saturated fatty acids and medium-chain triglycerides (MCT), which are both easily burned as fuel by the body. MCTs are particularly beneficial in that they don’t require bile acids for digestion, and they’re directly shunted to the liver via the portal vein.
Coconut milk and fruit can be a great snack for Paleo folks, and coconut milk smoothies make a great Paleo breakfast choice – especially in the summer.
So what could be wrong with coconut milk? Here are three things to consider.
Bisphenol-A (BPA) is a chemical that has been used in consumer goods since the 50s. It’s found in reusable drink containers, DVDs, cell phones, eyeglass lenses, automobile parts and sports equipment. While the research on BPA is still mixed (some studies indicating harm and others not), given the uncertainty I think it makes sense to avoid it whenever possible.
BPA is used in the lining of certain canned foods. BPA especially leaches into canned foods that are acidic, salty or fatty, such as coconut milk, tomatoes, soup, and vegetables. Is BPA exposure common? You bet. This CDC report found BPA in the urine of 93% of adults. Perhaps most troubling is that companies like Nestle, Similac, Enfamil and PBM all use BPA in the linings of metal cans holding baby formula. This is scary in light of a recent study which found an association between neurobehavioral problems in infants and high levels of BPA in their mothers.
So what’s the solution here? In short, if you want to be on the safe side and reduce your exposure to BPA, you have to reduce your consumption of canned foods (including coconut milk) as much as possible. I made this recommendation in 9 Steps for Perfect Health-#3: Eat Real Food. A study published in Environmental Health Perspectives found that families who ate fresh food for three days with no canned food, and using only glass storage containers, experienced a 60% reduction of BPA in their urine. The reductions were even higher (75%) for those with the highest BPA levels at the beginning of the study.
The good news, however, is that there are at least two brands of coconut milk that don’t have BPA in them. One is Native Forest, which you can purchase on Amazon if it’s not available at your local store. The other is Arroy-D, which is a brand imported from Thailand. You can get it here (but you have to scroll down and order the version that comes in cartons, not the cans at the top). I’m a little suspicious of Arroy-D, though, because one Thai reader mentioned that it does contain other ingredients aside from coconut milk. I don’t read Thai, so I can’t confirm this. If anyone out there can, please leave a comment below.
Coconut milk can also be made quite easily at home, with coconut flakes, a blender and cheesecloth. Here’s a video to show you how (get a load of the soundtrack). I find that blanching the coconut flakes prior to blending improves the results.
The other potential problem with canned coconut milk is guar gum. Guar gum is a galactomannan, which is a polysaccharide consisting of a mannose backbone with a galactose side group. It’s primarily the endosperm of guar beans.
Beans and legumes have a variety of compounds in them that make them difficult to digest, especially for people with digestive problems (1 in 3 Americans, from the latest statistics). In my clinical experience, many patients with gut issues improve when they remove guar gum from their diet—including canned coconut milk.
Unlike BPA, there’s no evidence that guar gum may cause serious harm. So, if you’re able to tolerate guar gum, there’s no reason to avoid it. If guar gum does give you digestive trouble, Native Forest has just released a new version of its product that doesn’t contain it, and Arroy-D also does not have it. The other option, of course, is making coconut milk at home.
Fructose malabsorption (FM) is a digestive disorder characterized by impaired transport of fructose across the small intestine. This results in increased levels of undigested fructose in the gut, which in turn causes overgrowth of bacteria in the small intestine. Undigested fructose also reduces the absorption of water into the intestine.
The clinical effects of FM include: intestinal dysbiosis, changes in motility, promotion of mucosal biofilm, and decreased levels of tryptophan, folates and zinc in the blood. Symptoms produced include bloating, gas, pain, constipation or diarrhea, vomiting and fatigue (to name a few). Recent research has also tied fructose malabsorption to depression.
Lest you think this isn’t a common problem, studies have shown that up to 40% of people in Western countries suffer from fructose malabsorption.
Even in healthy people without fructose malabsorption, however, only about 20-25g of fructose can be properly absorbed at one sitting. Glucose assists in transport of fructose across the intestine, so in general foods with equal amounts of glucose and fructose will be better absorbed than foods with excess amounts of fructose (in relation to glucose).
While fructose malabsorption can cause symptoms in anyone, those with Irritable Bowel Syndrome (IBS) or Inflammatory Bowel Disease (IBD) are particularly affected. While the prevalence of FM is the same in healthy populations and those with IBS & IBD, the experience of FM appears to be more intense in the latter group. This is probably due to the increased visceral sensitivity common in IBS and IBD patients.
In fact, one of the most promising clinical approaches to treating IBS & IBD right now is something called the FODMAP diet. FODMAP stands for Fermentable Oligo-, Di- and Mono-saccharides And Polyols. These include:
fructose (fruits, honey, HFCS)
fructans (wheat, onions)
lactose (milk sugar)
polyols (sugar alcohols like sorbitol, xylitol & mannitol, along with fruits like apples, pears and plums)
galactooligosaccharides (legumes & beans, brussel sprouts, onions)
other sweeteners like polydextrose and isomalt
Studies have found that restricting FODMAPs can significantly improve the symptoms associated with IBS, IBD and fructose malabsorption.
What does this have to do with coconut milk, you ask? According to Drs. Gibson & Barrett, experts in fructose malabsorption, coconut milk is is a FODMAP and should be avoided by people with digestive conditions like IBS & IBD.
According to NutritionData.com, coconut milk has very little sugar of any kind – including fructose. Nevertheless, I do have patients that cannot even tolerate homemade coconut milk (which has no guar gum in it), even though they are fine with coconut oil. I assume that they are reacting to the fructose in the coconut milk – but I can’t be sure.
Let’s bring this together into recommendations for three different groups of people:
Women who are trying to get pregnant, pregnant or breastfeeding, children and other vulnerable populations (chronically ill): should avoid canned coconut milk products except for those that are BPA-free, like Native Forest and Arroy-D. Note: Native Forest is organic, but Arroy-D is not.
People with digestive problems (IBS, IBD, GERD, etc.): may want to avoid coconut products entirely, except for coconut oil
Healthy people: may be fine with canned coconut milk, provided they don’t react to the guar gum, and provided they’re willing to take the side of industry scientists that claim BPA doesn’t cause harm in humans
Want organic coconut milk – but without the BPA and guar gum?
As of the time of this writing there is no widely available commercial brand of coconut milk that is organic and free of BPA and guar gum. The good news, however, is that with a little extra effort you can easily make this at home yourself.
Purchase coconut cream (Let’s Do Organic and Artisana are good choices) and blend with water to make coconut milk.
Purchase shredded coconut (again, Let’s Do Organic is a good choice), and follow the instructions below for making homemade coconut milk.
Homemade coconut milk instructions
4 cups water
1.5 – 2 cups unsweetened coconut flakes
Heat water until hot (but not boiling).
Add shredded coconut and water to blender (preferably a Vitamix!) If all of the water won’t fit, you can add it in two batches.
Blend on high for several minutes until thick and creamy.
Pour through a colander to filter out the coconut pulp, then squeeze through a cheese cloth
or nut milk bag to filter the smaller pieces of coconut.
If you separated the water into two batches, put the strained coconut back into the blender with the second batch of water.
Drink immediately or store in the fridge. Fresh coconut milk should be used within 3-4 days of making it for the best flavor and texture.