Updated: 05/17/2016 - Website operated by Leptigen

Special K Challenge Review - Does This Diet Plan Work? Are lack of results and extreme calorie restriction deal breakers?

Editor's Review: 3.5 / 5.0
Special K Challenge Review

The results of my research into the Special K Challenge were quite interesting. We decided to put their claims to the test with one of our in-depth reviews. We looked at the ingredients, side effects, health concerns, customer service and scientific support behind their promises. We also checked out the experiences we found online to see if this was indeed a healthy way to lose weight. Then, we collected and condensed the information to give you the bottom line.

EDITOR'S TIP: Combine Special K Challenge with a proven fat burner such as Leptigen for better results.

What is the Special K Challenge?

To start, the Special K Challenge is a meal replacement plan where you substitute two of your meals with one of Special K’s products. For breakfast, lunch or dinner, dieters can have a serving of cereal, waffles or protein bars. The options are readily available at most grocery stores and can be taken just about anywhere, making this diet convenient and easy to follow.

Kellogg’s has been around since 1906 and they’re a well-known, reputable company in the food industry. This diet was introduced in 2011 as a way to reduce caloric intake while making sure that your body gets the fiber it needs. It is affordable and easy to follow, there’s plenty of support online and Kellogg’s customer service is easy to get in touch with, but read on…

Lack of Results – “Minimal Loss at Best?”

The first thing we encountered with the Special K Challenge was minimal weight-loss or even a gain. “The plan may result in dieters consuming a dangerously low amount of calories,” said our Research Editor. “This can put the body in starvation mode and that’s the last thing you want.”

“I gained three pounds on the Special K Challenge,” said one user.

“I was always hungry, and couldn’t fill my stomach with the foods they offered,” said another.

Extreme Calorie Restriction – “A Problem”

Because of the low caloric intake encouraged by the diet, many experts have called this one an unsafe way to lose weight. “The Special K Challenge only allows dieters to consume a maximum of 829 calories per day, which isn’t enough to keep the body healthy,” said one expert online. The company also pushes their own foods, some of which contain high amounts of sugar, making it harder to lose weight.

“Without balance and a normal caloric intake, long term weight loss is unsustainable,” offered another.

Many customers agreed with these experts as well. “I felt like my body wasn’t getting enough, the Special K products just weren’t giving me the calories I needed to make it through the day,” said one review.

Most experts recommend a balanced third meal with the Special K Challenge. “With a third meal, participants see an average daily intake of 1500 calories, which is a healthy number for those trying to lose 2-3 pounds per week,” claims one expert.

Our experts have researched weight-loss habits and have shown that if there’s something particularly troublesome about a diet (cost, side effects, unhealthy recommendations, difficult workouts, etc.) the likelihood of long-term results is slim. If the Special K Challenge really does promote an extremely low caloric intake, this could make it difficult for many people.

The Science – “Any Proof?”

There’s plenty of science out there proving that eating less can help you lose more, so the Special K Challenge definitely has that going for it. Unfortunately there’s also research proving that it’s unhealthy to consume less than 1200 calories per day for the average adult. This plan encourages abnormally low caloric intake, which can be dangerous for many people. At DietSpotlight, we recommend a balanced diet with supplements that are scientifically tested and shown to help you burn fat and boost metabolism.

The Bottom Line – Does the Special K Challenge Work?

Well now, this one left us with a sour taste in our mouth. The Special K Challenge was an intriguing review for us. Anytime a company that has been around for over 100 years, like Kellogg’s has, we tend to believe what they say. Unfortunately, the low caloric intake that they encourage is proven to be an unhealthy path to sustainable weight-loss. Because of that, we are hesitant about giving this one our support. We’re also concerned with the lack of results and the absence of exercise recommendations to accompany this diet plan.

If you’d like an alternative that is healthy and supports sustained weight-loss, we suggest you find a product that is made with clinically tested ingredients and is a shown to help many lose weight without putting the body into starvation mode.

Among the best products we’ve seen in 2016 is one called Leptigen. This new diet supplement contains four clinically tested ingredients that offer benefits for helping to improve metabolism and fat loss. Reviews online don’t mention many negative side effects, but they do talk about dieters seeing great results. This is everything you should be looking for in a weight-loss supplement.

A  Special Trial Offer is being offered for a limited time by the makers of Leptigen, showing that they’re confident you’ll see results. You’ve got absolutely nothing to lose but that extra weight!

Leptigen ups the ante by offering fast, reliable worldwide shipping. That means if you’re in India, the UK, the United Arab Emirates, or others, all you have to do is head over to the order page and choose your country. You can learn more about one of the most popular weight-loss supplements on the market today.

Learn More About Leptigen »
GD Star Rating

How Does Special K Challenge Compare?

Previous Special K Challenge Review (Updated March 14, 2014):

What You Should Know

Click Here To See Our Highest Rated Review

The Special K Challenge was designed by Kellogg around their Special K breakfast cereal. According to Kellogg, the Special K Challenge will help you lose six pounds or 1 inch in two weeks.

The details of the plan are: eat two Kellogg's meals for breakfast and lunch and then a healthy dinner. Breakfast can be either 1 cup of Special K cereal with 2/3 cup of skim milk or Special K Waffles with light syrup. Lunch can be the cereal again or the Special K Protein Meal Bar. You are to eat vegetables and fruit throughout the day as snacks and can drink any beverage as normal. You are also allowed two Special K Protein Snack Bars during the day.

The purpose of the diet is to reduce overall calories, which you would certainly do if two of your meals consisted of one cup of cereal. This diet plan is contrary to other plans such as the South Beach Diet or the G.I. Diet, which promote higher levels of proteins than this diet. The Special K Challenge is carbohydrate intensive which helps to put fiber into the diet but may not promote long term satiety or energy.

There is substantial feedback on the Special K Challenge across the internet and it is quite mixed. The majority of posters speak about being hungry all the time while on the diet. This may be due to the reduced protein. Protein makes the body feel fuller longer whereas carbohydrates raise blood glucose levels quickly and give an immediate boost but do not last as long.

The Special K Challenge would also be rather expensive when compared to preparing your own meals at home. The protein bars are similar in price to many competitive products and range from $1.00 to $2.50 per serving.


Healthy foods and Special K products.

See Our Featured


  • Easy to follow plan.
  • May reduce overall calories and produce short term weight loss.


  • Expensive when compared to homemade food.
  • Does not provide long term guidance for weight management.
  • May not provide sustained energy or satiety.
  • Doesn't boost the body's metabolic rate.


While the Special K Challenge may sound like fun, especially with the personalized plan, we feel it lacks substance as a reasonable long term weight reduction plan. Many experts agree that the best weight loss plans include a permanent change in eating habits along with exercise to burn calories and boost the body's metabolism. There are also many weight loss products on the market today that work in conjunction with better nutritional management to burn fat. We feel that this may be a better solution than the Special K Challenge.

Special K Challenge Questions & Answers:

We read and digested hundreds of customer reviews about the Special K Challenge in order to write this FAQ.

What are the side effects of the Special K Challenge?

Customers did not report any Special K Challenge side effects. In fact, the lack of results is the major concern.

What are the ingredients in the Special K Challenge?

The Special K Challenge ingredients depend entirely on the product you choose.

Does the Special K Challenge work?

There is evidence that lowering caloric intake can help you lose weight. However, the Special K Challenge may have a caloric intake below 1200, so check with your physician before starting.

You may want to try Leptigen if you are looking to boost metabolism without the hunger factor.

How much does the Special K Challenge cost?

The combination of products available for the Special K Challenge allows for a wide range of prices. However, if you bought their cheapest cereal and replaced two meals a day with this cereal, it would cost about $20 a month, without snacks or any other products. Depending on the food chosen, the price may get a little steep.

How should I follow the Special K Challenge?

Two meals should be replaced with a Special K product, preferably cereals, bars, or waffles. Snacks from the product line may also be purchased.

Can I take the Special K Challenge if I have a health condition?

Before you start any weight-loss program, consult your physician, especially if you are pregnant, nursing, under 18 years of age, or suffering from any health condition.

What do users like about the Special K Challenge?

Customers like that the Special K Challenge includes a variety of products to choose from.

What do users NOT like about the Special K Challenge?

Customers do not like that the Special K Challenge leaves them feeling hungry.

How do I contact the Special K Challenge customer service department?

You can contact Kellogg’s customer service department by letter or via phone at 1-800-962-1413. There’s also a contact form on their website.

What products are included in the Special K Challenge?

The Special K product line includes cereal, frozen breakfasts, bars, treats, crackers, chips, and shakes.

Is the Special K Challenge gluten free?

The Special K Challenge offers a line of products that are gluten-free.

Does the Special K Challenge come with a guarantee?

The Special K Challenge does not come with a guarantee.

Do you know of any special deals or discounts on the Special K Challenge?

Any special deals or discounts for the Special K Challenge will depend on the retailer. However, if want to try out a great deal customers love, you may want to check out the Special Trial Offer for Leptigen. Click here to try it out.

41 User Reviews About Special K Challenge

Leave comments below
  • 1

    its really works and no side effects i loss 33 pounds with in 2 months


  • 2

    How much quantity of milk and K food should b eat?


  • 3
    Your Name

    What is the price of special k???is it really worksd for 20 year old girl.now my weight is about 57 kg


    Stephen (Editor)

    It depends on which products you buy for your challenge: cereal, bars, snacks etc. Not terribly expensive. It is safe for you? Yes, but as for whether it works, we have a few concerns…


  • 4

    How to eat by adding milk r wt???


    Stephen (Editor)

    Yes if you buy the cereal, but they also have bars and other food items.


  • 5

    Is this realy works to lose weight?


    Stephen (Editor)

    Well Pooja, while we like that it promotes healthy eating we have a few concerns with the sugar content in some products and its apparent lack of lasting results by dieters. Refer to the article for more info


  • 6

    I just started it to day I have 10


  • 7

    well, i’ve been on the diet for 1 wk. i bought all the special k products and have been very careful to follow the diet. i think the recipes are good ones as well as easy to fix. sad to say, i’ve actually gained 3 lbs so far. i went back & reviewed the diet plan carefully, so i’m not sure what the problem is. i don’t have a lot of experience with dieting, but this diet has lots of sugar in it, which is surprising to me. i also work out everyday, so i guess this diet is just not kicking up my metabolism.



    It might just be water weight.


    Your Name

    you can change your menu every day. if you want to eat something on there that has less cal then what they have on your menu you can swap it out. that’s what i did and you dont have to eat all the food if it says sandwhich fruit and something else. just east the sandwhich and see if your full save your fruit for later for an evening snack. i spread out the food that was on my menu and i was never hungry and i only ate enought to fill me up


  • 8

    is it really wrk n hw to eat i mean by adding milk or sumthng els plz do rply n m 17yrs now


  • 9

    It is in reality a great and helpful piece of info. I’m satisfied that you just shared this useful info with us. Please stay us up to date like this. Thank you for sharing.


  • 10

    How many time should eat at a one day?;the age of 22 girl can eat?


  • 11

    I am 16 years old and weighed 160 pounds when I started the day before yesterday. I weighed myself today and I now weigh 158 pounds . 😀 ! This diet IS very hard to stick to though if you’re use to eatting whatever you’d like through out the day. I suggest drinking ALOT of water, and lots of fruits and vegetables to keep yourself from feeling hungry. And make sure to not eat past 6:30 !


  • 12

    I was on the special K challenge right before i got pregnant i was working on losing the weight on put on from my 4 year old i was 155lbs when i started the special k and i got down to 139. i followed my meal plans every day and i was never starving on this challenge. i just had a baby and he is 6months old, i am 170lbs right now i am planing on going back on the special k challege to lose weight again. i say the challenge works and will give it 5 stars.


  • 13
    Alec Smith

    Believe it or not, it really can work. I started this diet several years ago and it worked for me. What I can say is, with any diet where you eat less than you are used to, your body is going to expect the same amount it has gotten before, so yes, you will be a little unsatisfied with the portion at first. Eventually your body does get used to it and you will be pleased with the results. I did it much longer than 2 weeks, I did it for about 2 months! While I’m sure the possibility of gaining weight at first is very true, as I stated above you will get used to it and will lose weight quickly. Think of it as training wheels for yourself. Mix the Special K diet with casual exercise (riding a bike, or even walking for that matter) and you’ll be surprised how easy it is to change your habits, well, personally speaking anyways. On a side note, by the time I stopped the diet, my metabolism was at an all time high and I continued to lose weight for quite some time after I ended the diet.

    While they recommend eating cereal for 2 meals, I normally ate it for all 3. I cut out sodas almost entirely and I would drink “occasionally” a diet soda, but juice and water goes much better with cereal and its much better for you. In the end it’s all about training yourself. There are no “easy” diets because they all “can” be, it just depends on how dedicated you are as an individual. don’t be discouraged if you don’t see results immediately, just know that you WILL get the results youre looking for, just work hard for it! And the fact that you don’t even HAVE to exercise on the Special K challenge makes it attainable for anyone. Just get the temptation out of your household if possible, keep plenty of fruits and veggies to snack on (and I don’t mean dipping veggies in ranch or fruits in caramel). You’d be surprised how well it works. Best of luck to anyone who does this!


  • 14

    This challenge won’t hurt you.It clearly has all things you need to lose weight healthy. I am tired of food ruling my life and something as easy as the challenge will simplify my life. The only change I am going to make is the ceral and small fruit for breakfast if I eat early I will have protein product for morning snack and if I am out I will eat sensibly some small health meal[I don’t need to eat like a cow. If there is a good space before dinner I will have a challenge drink or snack. If I had a nice lunch out I will have a bowl of cereal and fruit for dinner and snack for mid evening. This is a challenge I can live with and I plan to make it my life plan. Thank you.


  • 15

    Helloo!! ok, so i am going to try the diet today or tomorow. to people who don’t think they can afford the special k diet.. just buy the cereal and eat 3 bowls of cereal and your snacks could be vegs.. 🙂 thats what im doin..!! <3 thanks!


  • 16

    Please give me the price of special K challenge.


  • 17

    I hope you guys actually think next time you try to make a valid argument. You’re supposed to fill up to at least 1200 calories with fruits and veggies alongside the special k products. If you’re only eating those small products, that’s your own stupidity, and not the fault of the diet. Your body only needs 1200 calories a day.



    Well said. It clearly says that you can eat as much fruit and veg as you like throughout the day


  • 18

    This plan (if you follow their meal suggestions) only offers a little over 800 calories. Your body needs around 1500 calories to function. So yeah, you’ll feel hungry. It’s an insane diet.



    I think this diet would work for people that want to lose weight. I lost 8 lbs in 2 days. That’s because I had flu like symptoms and used the bathroom for 2 days straight! Waaaay too much fiber for me!


  • 19

    lol that is fuuny!!


  • 20

    not that good to some ple so i did do and im tellin my friends not to do it so dont it can hurt u and u can die



    The Special K Challenge can hurt you and kill you? From what I have heard it has helped lots of people lose unwanted weight. As for hurting you or killing you, so can driving in your car if there is a crazy person driving around you. Maybe it didn’t work well for you but that doesn’t mean that it won’t for someone else or hasn’t for many people already!



    lol….lol….thats the funniest thing i have ever heard!!! i think McDonalds will kill you before special k does lol



    You’re right, so ignore the lols. It’s a starvation diet, just over half what your body needs to function.



    Starvation diet? You’re eating at least 7 times per day while on this diet….just not Burger King or Taco Bell which is part of the reason why we are by far the country with the most obese people…stop reading these posts if you’re against the plan.


  • 21
    Renee Itts

    how do I follow the video and work out???????????


  • 22

    My husband and I started this together. We have either cereal or shake for breakfast and dinner with our regular meal being lunch. This prevents the big meals at the end of the day. This biggest benefit to us is portion control and reduced calories. This plan also gives us the option to switch things around. If we know we are going to dinner with the parents then we flipped and have shakes (or cereal) for lunch. Eating reasonably for your one regular meal and exercise is key. If you can do the little things to cut calories (light bread, 2% cheese and baked chips) you can get yourself to the lower end of the calorie scale. We have found this easier to do during the summer months as we prefer to be outside in the evening either walking or riding bikes which there is more time to do since dinner prep time is drastically cut. We have also switched out the snacks on occasion to the Nabisco (or whatever brand) of 100 calories. Gives you a little more variety while still maintaining the calorie count. Since we have began, we have both noticed fewer cravings of the sweets, require smaller portions for our “main” meal and weight loss. In the first two weeks, he lost 15 pounds while I lost 8. We both feel healthier and have completely embraced watching what we eat.


  • 23

    i just started the special k challenge last sunday, so it has almost been a week. i love it so far i dont feel like any changes have been made yet but it takes 2 weeks. but i just eat the cereal for breakfast then lunch have a protein shake and snack bar then for dinner il have another protein bar and eat some veggies. but i also allow myself to snack on the multi grain special crackers after lunch. i havent been working out yet but plan to.


  • 24

    I like the Special K program. For me, I have to have a plan that is simple to follow and food that taste good. With the variety of cereals Special K makes, this program easy. I especially like the snaks that they have (their new strawberry crisp bars are heaven sent and only 100 calories). I have followed the program for over a month now and have lost 14 pounds. But of course I am exercising as well and eating a healthy meal before six pm. My suggestion is that if you are looking for a simple porgram to follow …and you enjoy eating cereal..than you should give this program a try. If you eat the fruit and veggies as they suggest…you will not go hungry.



    I am now on my 4th day of Special K challenge along with the 10lb slimdown workout. I realized that eating the vegetables and fruits with meals and snacks helps with hunger. So far I am happy with the plan.


  • 25
    vandana singh

    my BMI is 23.5 it’s safe when i will take kellogg’s k challenge plese tell me


  • 26
    Mary Hicks

    special k is no longer carrying the points for the rebate 10 dollars off jeans. tired of paying full price


  • 27
    Audrey Tesiero

    Im starting your specail k challenge tomorrow. Ive been on weight watchers but havent been doing that for the last 5 months. I love your products and think the two plans together will be great and easy to loose the 12 lbs. Ive put back on. I will let you know how Im doing. Thanks Special K


  • 28
    rosalyn stevenson

    what is aspecial diets meal.


    Your Name

    can its relly work


Have a comment or question about Special K Challenge?