LCTs tend to produce fat in the body, while MCTs promote weight loss. People in the animal feed business have known this truth for quite some time as well. If you feed animals vegetable oils, they put on weight and produce more meat. If you feed them coconut oil, they will be very lean and active.
In a study published in the American Journal of Clinical Nutrition, for example, rats were fed MCTs and LCTs for a period of six weeks. At the end of six weeks the rats were killed and dissected, and the total dissectible fat and fat cell size and number were determined. MCT-fed rats gained 15 percent less weight than LCT-fed controls. Their conclusion was that “overfeeding MCT diets results in decreased body fat related to increased metabolic rate and thermogenesis.”13
Polyunsaturated oils can also contribute to weight gain by suppressing thyroid functions, causing a lower metabolic rate that leads to packing on the pounds.
Dr. Ray Peat says:
Linoleic and linolenic acids, the “essential fatty acids,” and other polyunsaturated fatty acids, which are now fed to pigs to fatten them, in the form of com and soy beans, cause the animals’ fat to be chemically equivalent to vegetable oil. In the late 1940s, chemical toxins were used to suppress the thyroid function of pigs, to make them get fatter while consuming less food. When that was found to be carcinogenic, it was then found that corn and soy beans had the same anti-thyroid effect, causing the animals to be fattened at low cost. The animals’ fat becomes chemically similar to the fats in their food, causing it to be equally toxic, and equally fattening. 14
I have added coconut oil to my weight loss program, which is basically low carb, moderate protein, and reasonably high fat. I used this type of diet a few years ago and lost weight, but I “fell off the wagon” and put the weight back on. The major difference this time is that I have replaced all vegetable oils (corn, soy, canola, and so forth) with coconut oil and olive oil. When I eat a meal that has very lean protein, I take extra coconut oil. I have lost 58 pounds since December [that’s in just 8 months] with no exercise beyond a couple of walks per week. One positive side effect is that my resting heart rate has gone from 79 to 59.
I’m never hungry. In fact, I have to eat more than I feel like eating. Often times I could skip a meal, but I don’t do it because I don’t want my body to go into a starvation mode.
Perhaps the best part is that a lot of people are telling me I look younger.
Chuck
The Slimming Fats
Coconut oil, on the other hand, is nature’s richest source of MCTs, which increase metabolic rates and lead to weight loss. MCTs promote what is called thermogenesis. Thermogenesis increases the body’s metabolism, producing energy. There are many studies proving this in the scientific literature.
In 1989 a study was completed in the Department of Pediatrics, Vanderbilt University, Nashville, Tennessee. Ten male volunteers (ages 22 to 44) were overfed (150 percent of estimated energy requirement) liquid formula diets containing 40 percent fat as either MCTs or LCTs. Each patient was studied for one week on each diet in a double-blind, crossover design. The researchers noted the following results: “Our results demonstrate that excess dietary energy as MCT stimulates thermogenesis to a greater degree than does excess energy as LCT. This increased energy expenditure, most likely due to lipogenesis [formation of fatty acids] in the liver, provides evidence that excess energy derived from MCT is stored with a lesser efficiency than is excess energy derived from dietary LCT.”15
In another study recently conducted at the School of Dietetics and Human Nutrition, McGill University, Ste-Anne-de-Bellevue, Quebec, Canada, the effects of diets rich in medium-chain triglycerides (MCTs) or long-chain triglycerides (LCTs) on body composition, energy expenditure, substrate oxidation, subjective appetite, and ad libitum energy intake in overweight men was studied. Twenty-four healthy, overweight men with body mass indexes between 25 and 31 kg/m2 consumed diets rich in MCT or LCT for 28 days, each in a crossover randomized controlled trial. The researchers concluded: “Consumption of a diet rich in MCTs results in greater loss of AT compared with LCTs, perhaps due to increased energy expenditure and fat oxidation observed with MCT intake. Thus, MCTs may be considered as agents that aid in the prevention of obesity or potentially stimulate weight loss.”16
One “slimming fat” is a little known fatty acid called conjugated linoleic acid (CLA) found almost exclusively in ruminant animals and dairy fats. Research has shown that CLA tends to normalize body fat deposition. Without CLA, dietary fat tends to be stored in fat cells. Because CLA is negligible in most Western diets, we can have trouble controlling our weight. The body cannot produce CLA; we must get it from our food, the primary sources being beef and dairy products.
We can, however, make CLA from the trans-vaccenic acid that comes from milk fat.17 But most of us don’t eat much butter, cheese, or cream. Eating these products sparingly is a good idea because most of the animals in this country are not organically raised; indeed, they are injected with or fed antibiotics and growth hormones and pesticide sprayed food. Toxins tend to be stored in the fat more than the muscle, and therefore, eating a lot of animal fat from factory farm-raised animals isn’t the best idea.
We do tend to eat a lot of meat products in this country, so why are our CLA levels so low? People who study such things have found that the CLA content of these foods, if produced in the U.S., is low. CLA count started falling around 1950, about the same time that farmers began feeding cattle and dairy cows in feedlots, rather than allowing them to graze in pastures. It is eating grass that produces CLA in dairy cows and cattle.
In light of these facts, it is best to purchase grass-fed beef that has been raised organically (not injected with hormones and antibiotics), and to purchase dairy products from cows that are grass-fed and raised organically.
Best of all, you can include one of the most effective slimming fats, virgin coconut oil, into your daily diet and watch the pounds melt away.
I lost 17 pounds taking coconut oil. I did nothing else but add it to my skillet for dinner on some, but not all, nights and maybe in a few other experimental recipes.
Malikah
More Scientific Evidence on the Weight-Loss Effects of MCTs
Scientific studies have reported that the fatty acids from MCTs are not easily converted into stored triglycerides, and that MCTs cannot be readily used by the body to make larger fat molecules.18 One animal feeding study evaluated body weight and fat storage for three different diets—a low-fat diet, a high-fat diet containing long-chain triglycerides (LCTs), and a high-fat diet containing MCTs. All animals were fed the selected diets for a period of 44 days. At the end of that time, the low-fat diet group had stored an average of 0.47 grams of fat per day; the LCT group stored 0.48 grams/day, while the MCT group deposited only 0.19 grams of fat per day, a 60 percent reduction in the amount of fat stored. The authors conclude: “the change from a low-fat diet to an MCT-diet is attended by a decrease in the body weight gain.”19
This study points out two important facts: First, when MCTs are substituted for LCTs in the diet, the body is much less inclined to store fat. Second, when we eat sensibly, a diet containing MCTs is more effective than a low-fat diet at decreasing stored fat.
In a human study, researchers compared the metabolic effects of 400-calorie meals of MCTs and LCTs by measuring metabolic rates prior to and six hours following the test meals. The results showed that the MCT-containing meals caused an average 12 percent increase in basal metabolic
