Why are people talking about the SlimFast diet? Our attention turned toward ingredients, side effects, clinical research, peer-reviewed studies and customer service quality. Additionally, we dissected hundreds of dieter reviews and comments to see if anyone was successful in reducing caloric intake and weight. Then, we condensed and summarized to give you the information you need.
What is SlimFast?
First off, the SlimFast diet is a meal-replacement system offering ready-to-drink shakes, 100-calorie snacks and nutrition bars. The ingredients include amorphophallus konjac , rhizome, apple pectin, oat fiber, fat free milk, water, sugar, gum arabic, canola oil, milk protein concentrate, cellulose gel, coffee powder, mono and diglycerides, potassium phosphate, hydrogenated soybean oil, natural and artificial flavors, maltodextrin, dl-alpha-tocopheryl acetate, phytonadione, thiamine mononitrate , riboflavin, niacinamide, pyridoxine hydrochloride, and folic acid. You’ll replace one meal and incorporate a snack as needed, ideally to curb appetite and keep blood glucose level between meals.
The Slim Fast diet was introduced in 1977. The official website and local grocery stores sell the product line. The longevity of the company and the affordability are positives, but read on…
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How’s the Taste of SlimFast Powder?
The first concern about SlimFast ingredients is taste. “Meal-replacement shakes , nutrition bars and snacks are intended to substitute regular foods,” said our Research Editor. “If the dieter doesn’t like the flavor, that is more than enough to keep them from sticking with the SlimFast products. If you don’t maintain a reduced-calorie diet, you are less likely to shed weight.”
“I purchased Cappuccino Delight. Delightful it’s NOT. The taste reminds me of burnt coffee beans,” said one customer using the Slimfast meal replacement.
“Too much sugar , way too sweet and chocolaty. Does not feel like a meal,” said another user.
On the other hand, we found SlimFast reviews that didn’t mention poor taste.
“Fills me up and tastes good,” reported a dieter.
Is the Slim Fast Diet Causing Side Effects?
As we read through more and more reviews, side effects of Slim Fast were a concern. “It gave me gas and diarrhea.  Never tried it again,” said a customer.
“The first gave me stomach pain. Within an hour the diarrhea  began again,” said another.
While SlimFast side effects were a concern for some, others didn’t mention adverse reactions.
“No gastrointestinal issues to speak of,” reported a customer.
“There’s no effects on my digestive system ,” stated another.
Our research has shown that it often takes a tiny thing, like Slim Fast reviews talking about side effects, to slash the dieter’s chances of success. If Slim Fast powder reviews do say it can cause some stomach or digestive issues, that could be an issue.
The Science – “Any Research Behind the Shake?”
Slim Fast does mention some studies relating to its effect on weight-loss. There’s even scientific evidence supporting using meal replacements to cut calories. Unfortunately, when we searched PubMed and various medical journals, we were unable to find any peer-reviewed studies to prove it works. It does contain protein and human studies have shown it to “[induce] sustained reductions in appetite.”  We’d like to see a little more soluble fiber, as that ingredient can slow the digestive process. 
At DietSpotlight, we look for solid science. When there’s no clear link to clinical studies, we get concerned. We’ve found far too many readers asking, does SlimFast work? We’d really need research to say yes, as it pertains to this specific brand.
What Users Are Saying
"Appetite is down and I snack less. The shakes have higher carbs and calories than I like to so in order to make sure I keep the calorie intake down I am take by Biotek Nutrition – Weight Loss Aid Diet Pill Blocks the Absorption of Carbs and Fats before meals. Works like a charm."
"The vanilla flavor is really good. However, not really satisfying as to curbing hunger pangs. Lasts only a short period of time."
"Tastes great EXCEPT (or perhaps I should say because), the first ingredient is sugar. Way too much sugar for me."
The Bottom Line – Does Slim Fast Work?
So, are you heading out to buy a case of SlimFast Advanced Shakes? Well, we like the longevity of the company and it’s affordable, but we’re hesitant about this one because the research doesn’t directly link it to weight-loss, there are no dedicated peer-reviewed studies and elements in the formula that could disrupt or slow the digestive process, like fiber, to reduce hunger and slow the onset of appetite are missing. We’re also concerned about the fact that beverages are not as effective as solid foods in terms of satiety. 
Do you want to trim down a bit? If so, we suggest going with a supplement with a formula containing clinically tested ingredients shown to help promote weight-loss. It’s not that we’re putting down SlimFast products, we just tend to err on the side of our scientific research.
Among the best products we’ve seen this year is one called Dietspotlight Burn. It features four clinically-tested ingredients which have been shown to help accelerate metabolism, ignite fat loss and fight hunger. We’ve found some pretty amazing user reviews and customer service rocks.
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