If you’ve been having difficulty losing weight, will changing from diet soda back to regular actually help you lose weight? Or putting a few packets of sugar into your coffee instead of the artificial sweetener?
A new study that came out this week suggests that consuming artificially sweetened foods/ beverages will somehow trigger your brain to consume more calories later in the day. So while you may initially save the 30 calories from 2 packets of sugar or 120 calories from a can of regular soda, you will more that make up for it with extra calories later in the day. Their theory is that when you (actually rats which were used in the study) eat something sweet, the body actually gears up to start digesting this sweet food/drink. When it doesn’t actually receive something caloric, the body will actually consume more calories later on or expand fewer calories in the form of activity.
Here is the actual study:
Artificial sweeteners linked to weight gain
Cutting the connection between sweets and calories may confuse the body, making it harder to regulate intake.
WASHINGTON — Want to lose weight? It might help to pour that diet soda down the drain. Researchers have laboratory evidence that the widespread use of no-calorie sweeteners may actually make it harder for people to control their intake and body weight. The findings appear in the February issue of Behavioral Neuroscience, which is published by the American Psychological Association (APA).
Psychologists at Purdue University’s Ingestive Behavior Research Center reported that relative to rats that ate yogurt sweetened with glucose (a simple sugar with 15 calories/teaspoon, the same as table sugar), rats given yogurt sweetened with zero-calorie saccharin later consumed more calories, gained more weight, put on more body fat,
and didn’t make up for it by cutting back later, all at levels of statistical significance.
Authors Susan Swithers, PhD, and Terry Davidson, PhD, surmised that by breaking the connection between a sweet sensation and high-calorie food, the use of saccharin changes the body’s ability to regulate intake. That change depends on experience. Problems with self-regulation might explain in part why obesity has risen in parallel with the use of artificial sweeteners. It also might explain why, says Swithers, scientific consensus on human use of artificial sweeteners isinconclusive, with various studies finding evidence of weight loss,weight gain or little effect. Because people may have different experiences with artificial and natural sweeteners, human studies that don’t take into account prior consumption may produce a variety of outcomes.
Three different experiments explored whether saccharin changed lab
animals’ ability to regulate their intake, using different assessments
–the most obvious being caloric intake, weight gain, and compensating by cutting back.
The experimenters also measured changes in core body temperature, a physiological assessment. Normally when we prepare to eat, the metabolic engine revs up. However, rats that had been trained to respond using accharin (which broke the link between sweetness and calories), relative to rats trained on glucose, showed a smaller rise in core body temperate after eating a novel, sweet-tasting, high-calorie meal. The authors think this blunted response both led to overeating and made it harder to burn off sweet-tasting calories.
“The data clearly indicate that consuming a food sweetened with
no-calorie saccharin can lead to greater body-weight gain and adiposity than would consuming the same food sweetened with a higher-calorie sugar,” the authors wrote.
The authors acknowledge that this outcome may seem counterintuitive and might not come as welcome news to human clinical researchers and health-care practitioners, who have long recommended low- or no-calorie sweeteners. What’s more, the data come from rats, not humans. However, they noted that their findings match emerging evidence that people who drink more diet drinks are at higher risk for obesity and metabolic syndrome, a collection of medical problems such as abdominal fat, high blood pressure and insulin resistance that put people at risk for heart disease and diabetes.
Why would a sugar substitute backfire? Swithers and Davidson wrote that sweet foods provide a “salient orosensory stimulus” that strongly
predicts someone is about to take in a lot of calories. Ingestive and
digestive reflexes gear up for that intake but when false sweetness
isn’t followed by lots of calories, the system gets confused. Thus,
people may eat more or expend less energy than they otherwise would.
The good news, Swithers says, is that people can still count calories to
regulate intake and body weight. However, she sympathizes with the
dieter’s lament that counting calories requires more conscious effort
than consuming low-calorie foods.
Swithers adds that based on the lab’s hypothesis, other artificial
sweeteners such as aspartame, sucralose and acesulfame K, which also taste sweet but do not predict the delivery of calories, could have
similar effects. Finally, although the results are consistent with the
idea that humans would show similar effects, human study is required for further demonstration.
In my opinion…
1. This study brings up an interesting concept that clearly needs more research. It has similar findings as a previous study that found a link between diet soda and increased of metabolic syndrome in children - so there possibly could be a connection between artificial sweeteners and appetite control. However further studies need to be done before the results can be called conclusive.
2. This study was done on rats (while the one with diet soda was done on humans). Do humans have the same physiological mechanisms as rats?
3. I am not a fan of artificial sweeteners - especially when consumed in excess. However, until further research is done, I wouldn’t recommend that you omit the lower calorie foods containing artificial sweeteners that you may be consuming and revert back to the higher caloric foods/drinks if you are trying to watch you weight. For example, a nonfat light fruit yogurt has 90 calories or less while its “regular” counterpart has ~ 250 calories. A diet soda has no calories while the regular one has 120 calories. On the other hand, if you want to consume the regular product, just be aware of the calories and work them into your eating plan.
4. You should pay attention to how your body feels as well as hunger levels after consuming these diet products. Perhaps you don’t feel
satisfied after consuming them or have the mentality that “I can eat a little more because at least I saved some calories with this diet soda”. Have you ever seen people at McDonalds loading up with the Big Mac and large fries but still consuming a diet soda? You want to avoid this mentality!
4. In my private practice, I have noticed that sweet foods, whether artificially sweetened or sweetened with real sugar, often trigger cravings in people. If this is the case with you, you should try to limit all refined sweets and focus more on natural foods such as fruit, nuts, nut butter on crackers, cottage cheese and fruit, whole grains, legumes, etc. Adding protein and/or a little fat to the carbs should help to control your cravings.
5. If you have been having trouble losing weight despite being careful with your calories and are exercising on a regular basis AND are consuming a fair amount of artificial sweeteners, it may worth it to try to avoid them as much as possible for a month or so to see if your weight changes. Just an experiment!
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Diabetes,
Diet,
Health,
High Blood Pressure,
Weight Gain,
Weight Loss
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