13 Studies on Coconut Oil and Its Health Effects

The Studies

1. White, MD, et al. (1999). Enhanced postprandial energy expenditure with medium-chain fatty acid feeding is attenuated after 14 d in premenopausal women. American Journal of Clinical Nutrition. DOI: 10.1093/ajcn/69.5.883

Details

Twelve females without overweight followed an MCT diet for 14 days. They consumed butter and coconut oil as their main sources of fat.

For another 14 days, they followed a long-chain-triglyceride (LCT) diet, consuming beef tallow as their main source of fat.

Results

After 7 days, the resting metabolic rate and the calories burned after meals were significantly higher on the MCT diet compared with the LCT diet. After 14 days, the difference between the diets was no longer statistically significant.


2. Papamandjaris AA, et al. (2000). Endogenous fat oxidation during medium chain versus long chain triglyceride feeding in healthy women. International Journal of Obesity. DOI: 10.1038/sj.ijo.0801350

Details

Twelve females without overweight consumed a mixed diet supplemented with either butter and coconut oil (MCT diet) or beef tallow (LCT diet) for 6 days. For 8 days, both groups consumed LCTs, so that the researchers could assess fat burning.

Results

By day 14, the MCT group burned more body fat than the LCT group. Resting metabolic rate was significantly higher on day 7 in the MCT group compared with the LCT group, but the difference was no longer significant by day 14.


3. Papamandjaris AA, et al. (2012). Components of total energy expenditure in healthy young women are not affected after 14 days of feeding with medium-versus long-chain triglycerides. Obesity Research. DOI: 10.1002/j.1550-8528.1999.tb00406.x

Details

Twelve women without overweight consumed a mixed diet supplemented with butter and coconut oil (MCT diet) for 14 days and beef tallow (LCT diet) for a separate 14 days.

Results

Resting metabolic rate was significantly higher on day 7 of the MCT diet, compared with the LCT diet. However, the difference was no longer significant by day 14. Total calorie expenditure was similar for both groups throughout the study.


4. Liau KM, et al. (2011). An open-label pilot study to assess the efficacy and safety of virgin coconut oil in reducing visceral adiposity. International Scholarly Research Notices. DOI: 10.5402/2011/949686

Details

Twenty people with either overweight or obesity consumed 10 mL of virgin coconut oil three times per day before meals for 4 weeks, or a total of 30 mL (2 tablespoons) per day. Otherwise, they followed their usual diets and exercise routines.

Results

After 4 weeks, the males had lost an average of 1.0 inches (2.61 cm) and females an average of 1.2 inches (3.00 cm) from around the waist. The average weight loss was 0.5 pounds (0.23 kg) overall and 1.2 pounds (0.54 kg) in males.


5. Assunção ML, et al. (2009). Effects of dietary coconut oil on the biochemical and anthropometric profiles of women presenting abdominal obesity. Lipids. DOI: 10.1007/s11745-009-3306-6

Details

Forty females with abdominal obesity took either 10 mL of soybean oil or coconut oil at each meal, three times per day for 12 weeks. This amounted to 30 mL (2 tablespoons) of oil per day.

The researchers also asked them to follow a low-calorie diet and walk 50 minutes daily.

Results

Both groups lost about 2.2 pounds (1 kg). However, the coconut oil group had a 0.55-inch (1.4-cm) decrease in waist circumference, whereas the soybean oil group had a slight increase.

The coconut oil group also had an increase in high-density lipoprotein (HDL) or “good” cholesterol, and a 35% decrease in C-reactive protein (CRP), a marker of inflammation.

Additionally, the soybean oil group had an increase in low-density lipoprotein (LDL) or “bad” cholesterol, a decrease in HDL (good) cholesterol, and a 14% decrease in CRP.


6. Sabitha P, et al. (2009). Comparison of lipid profile and antioxidant enzymes among south Indian men consuming coconut oil and sunflower oilDOI: 10.1007/s12291-009-0013-2

Details

This study involved 70 males with type 2 diabetes and 70 males without diabetes. Researchers divided the participants into groups based on their use of coconut oil versus sunflower oil for cooking over a 6-year period.

The researchers measured cholesterol, triglycerides, and markers of oxidative stress.

Results

There were no significant differences in any values between the coconut oil and sunflower oil groups. Those with diabetes had higher markers of oxidative stress and heart disease risk than those without diabetes, regardless of oil type.


7. Cox C, et al. (1995). Effects of coconut oil, butter and safflower oil on lipids and lipoproteins in persons with moderately elevated cholesterol levels.Trusted SourceJournal of Lipid Researchhttps://www.jlr.org/content/36/8/1787.long

Details

Twenty-eight people with high cholesterol followed three diets containing coconut oil, butter, or safflower oil as the main fat source for 6 weeks each. The researchers measured their lipid and lipoprotein levels.

Results

Coconut oil and butter increased HDL significantly more than safflower oil in females, but not in males. Butter raised total cholesterol more than coconut oil or safflower oil.


8. Reiser R, et al. (1985). Plasma lipid and lipoprotein response of humans to beef fat, coconut oil and safflower oil. American Journal of Clinical Nutrition. DOI: 10.1093/ajcn/42.2.190

Details

Nineteen males with normal cholesterol levels consumed lunch and dinner containing three different fats for three sequential trial periods.

They consumed coconut oil, safflower oil, and beef fat for 5 weeks each, alternating with their usual diet for 5 weeks between each test period.

Results

Those who followed the coconut oil diet had higher levels of total, HDL (good), and LDL (bad) cholesterol than those who consumed the beef fat and safflower oil diets. However, their triglyceride levels rose less than those who consumed beef fat.


9. Müller H, et al. (2003). The Serum LDL/HDL Cholesterol Ratio Is Influenced More Favorably by Exchanging Saturated with Unsaturated Fat Than by Reducing Saturated Fat in the Diet of Women. Journal of Nutrition. DOI: 10.1093/jn/133.1.78

Details

Twenty-five females consumed three diets:

  • a high fat, coconut oil-based diet
  • a low fat, coconut oil diet
  • a diet based on highly unsaturated fatty acids (HUFA)

They consumed each for 20–22 days, alternating with 1 week of their normal diet between each test diet period.

Results

In the high fat, coconut oil-based diet group, HDL (good) and LDL (bad) cholesterol levels rose more than in the other groups.

In the low fat, coconut oil-based diet group, LDL (bad) cholesterol levels rose more, compared with HDL (good) levels. In the other groups, LDL (bad) cholesterol fell in comparison with HDL (good).


10. Müller H, et al. (2003). A diet rich in coconut oil reduces diurnal postprandial variations in circulating tissue plasminogen activator antigen and fasting lipoprotein (a) compared with a diet rich in unsaturated fat in women. Journal of Nutrition. DOI: 10.1093/jn/133.11.3422

Details

Eleven females consumed three different diets:

  • a high fat, coconut oil-based diet
  • a low fat, coconut oil-based diet
  • a diet with mostly highly unsaturated fatty acids.

They followed each diet for 20–22 days. Then they alternated with 1 week of their usual diet between the test periods.

Results

Females who consumed the high fat, coconut oil-based diet had the largest reductions in markers of inflammation after meals. Their fasting markers of heart disease risk also fell more, especially compared with the HUFA group.


11. Kaushik M, et al. (2016). The effect of coconut oil pulling on Streptococcus mutans count in saliva in comparison with chlorhexidine mouthwash. Journal of Contemporary Dental Practice. DOI: 10.5005/jp-journals-10024-1800

Details

Sixty people rinsed their mouths with one of the following:

  • coconut oil for 10 minutes
  • chlorhexidine mouthwash for 1 minute
  • distilled water for 1 minute

Scientists measured levels of plaque-forming bacteria in their mouths before and after treatment.

Results

Those who used either coconut oil or chlorhexidine saw significant reductions in the number of plaque-forming bacteria in saliva.


12. Peedikayil FC, et al. (2015). Effect of coconut oil in plaque related gingivitis — a preliminary report. Niger Medical Journal. DOI: 10.4103/0300-1652.153406

Details

Sixty teenagers ages 16 to18 with gingivitis (gum inflammation) did oil pulling with coconut oil for 30 days. Oil pulling involves using coconut oil as a mouthwash.

Researchers measured inflammation and plaque markers after 7, 15, and 30 days.

Results

Markers of plaque and gingivitis fell significantly by day 7 and continued to decrease during the study.

However, there was no control group, so it’s not certain that coconut oil was responsible for these benefits.


13. Law KS, et al. (2014). The effects of virgin coconut oil (VCO) as supplementation on quality of life (QOL) among breast cancer patients. Lipids in Health and Disease. DOI: 10.1186/1476-511X-13-139

Details

This study involved 60 females who were undergoing chemotherapy for advanced breast cancer. They received either 20 mL of virgin coconut oil daily or no treatment.

Results

Those in the coconut oil group had better scores for quality of life, fatigue, sleep, loss of appetite, sexual function, and body image than those in the control group.

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