March 17, 2016

Kicked Out of Ketosis? The Dirty Little Secret About Ketone Testing Strips

If you hang out at low-carb forums for any length of time, you're bound to hear again and again how someone recently got kicked out of the state of ketosis and is looking for a fast way to get back in. 

Out of all the issues that you can have with a low-carb lifestyle, understanding ketone testing strips is one of the biggies.

I got kicked out of ketosis,” is one of the most common complaints I hear.

And while that may or may not be true, depending on the situation, there are a lot of misconceptions about the role that ketones and ketone testing strips play in a low-carb diet.

If you think that you've been kicked out of ketosis, listen up. Here's the dirty little secrets about ketone testing strips that you probably won't hear in a low-carb forum.

[Some of the links in this post are affiliate links. I might receive a small commission if you purchase something by using one of those links.]

Bowl of Fresh Raspberries
What Can Ketone Testing Strips
Actually Reveal to You?

What Can Ketone Testing Strips Tell You?

The only thing that urine ketone test strips can tell you is if you have acetoacetate ketones spilling over into your urine, the type of ketones that signal a diabetic is in danger of ketoacidosis.

  • They cannot tell you if you are in the state of ketosis.
  • They cannot tell you if you are burning body fat for fuel.
  • They cannot tell you if you overate too many carbs.
  • They cannot tell you if a particular food kicked you out of ketosis.
What they do is measure the relative acetoacetate ketone concentration in your urine.

Likewise, blood ketone test strips measure the relative beta-hydroxybuterate ketone concentration in the bloodstream, the amount of available ketones that haven't been used yet. While they can tell you if you are in the state of ketosis, and whether you're in the Ketone Zone, they cannot tell you:
  • why you are not losing weight
  • if you are burning body fat or dietary fat for fuel
  • if your body can use ketones effectively
  • if you are insulin sensitive or insulin resistant
What these ketone testing strips tell you is if you are in ketoacidosis, and that a certain number of beta-hydroxybuterate ketones are backing up in the bloodstream. Depending on how many ketones are available for the brain, you can also determine if you are not eating enough protein.

What Affects Ketone Levels?

Many low-carb dieters believe that the ketone testing strips are an easy way to fine-tune your low-carb diet. They think that since the strips reveal the concentration of ketones in the urine, the food or foods you ate just prior to testing will help you sift out problematic foods.

Shrimp with Spaghetti
Low-Carb Dieters Like to Test
 Low-Carb Pasta

In other words, foods too high in carbs will cause the ketone strips to give a negative reading while ketosis-friendly foods will turn the ketone strips at least pink, or darker.

When the strips don't change color, these dieters assume they've been kicked out of ketosis.
Because of these false beliefs, many low-carb foods are eliminated and the experience shared with others, so others don't make the same mistake and get kicked out of ketosis themselves.

If you don't know what's really going on here, how the ketone testing strips work, you might be tempted to banish those low-carb foods from your diet as well.

Newbies are particularly susceptible to these types of suggestions, since they haven't been on a low-carb diet long enough to make a judgment for themselves. However, those who have been on a low-carb diet several times before often feel anxious enough to lose weight that they quickly accept these misconceptions without checking out the information for themselves.

There are a lot of things that can affect the number of ketones spilling over into the urine or backing up in the blood:
  • How high was your insulin level at the time you tested?
  • Were you under any type of physical, mental, or emotional stress?
  • What time of the day did you test? Best time, or random?
  • How active were you just before you took the test?
  • How long have you been on a low-carb diet?
Urine testing is only accurate for that single moment in time. The sticks reveal what's going on with acetoacetate ketones at the exact moment you test. 

A minute later, or even an hour later, the results might be different because all the sticks can tell you is that something triggered the body into dumping those ketones. It can't tell you what that something was.

Problems With Ketostix and Lipostix Readings

A dark reading on the ketone strips is just as likely to be from consuming too many carbs as it is to be a signal of fat burning because when insulin goes up, more ketones are dumped. 

This dumping is the body's backup system for protecting you against ketoacidosis, and that holds true for both urine and blood testing methods for ketones.

If your blood concentration gets too high, it will trigger an insulin release in order to keep the ketones in the blood down to a safe level. Likewise, when you eat or drink something that triggers insulin, the body will dump ketones into the urine to make way for the anticipated glucose.

If you happen to be testing at the moment those ketones are dumped, you can mistakenly assume that what you ate didn't affect you. You might also be convinced that you got kicked out of ketosis, even if that isn't true.

In addition, fat adaption causes you to create fewer acetoacetate ketones and more beta-hydroxybuterate ketones, the type of ketones the brain uses, which means the urine testing strips will get lighter and lighter until they stop working completely. If nothing triggers the dumping of the acetoacetate ketones you do make, they won't be tossed.

Why Did Dr. Atkins Introduce Ketostix and Lipostix in His Books?

If the ketone sticks are so unreliable, then why did Dr. Atkins introduce them in his books?

Bowl of Raspberries with Whipped Cream
Ketone Test Strips
Enabled Dr. Atkins to 
Create His Revolutionary Diet

The urine ketone testing strips available at Amazon or your local drug store were how Dr. Atkins experimented on himself when he was creating the methods for his low-carb diet. 

They allowed him to see what worked and what didn't. 

Through use of the sticks, he was able to determine the speed at which to return carbohydrate foods to the diet, their effect on the dieter, and how to best determine one's carbohydrate sensitivity.

For those brand new to a low-carb lifestyle, the method works very well. You can easily learn how many carbohydrates are too many for your metabolism by using the various ketone-measuring sticks on the market today. 

What Dr. Atkins didn't anticipate was people ever wanting to walk away from his low-carb diet, although he did warn people that returning to Atkins Induction too often could backfire on you.

For Atkins, losing weight without hunger and feelings of deprivation were all it took to keep him from returning to his old style of eating, so he didn't realize the urine testing strips would eventually become a problem. 

Their initial purpose was to motivate you and help you discover your critical level of carbohydrate sensitivity.

They were not meant to be used indefinitely.

Once you know your upper limit for carbohydrate consumption, you don't need the urine testing strips any more, so while not perfect, Ketostix and Lipostix were the best way Dr. Atkins knew to show his patients and readers that burning fats for fuel was possible:

The clear premise for Induction is to switch you into a primarily fat-burning metabolism by sharply controlling carb intake. Your LTS [lipolysis testing strips] will help you measure the extent to which you've done so. Later, as you move through the other phases and increase your carbohydrate intake, the strips are no longer needed.” (Dr. Atkins' New Diet Revolution, 2002.)

In addition, he cautioned his readers to not take the ketone strips too seriously:

Should your LTS not turn pink or purple, despite the fact that you are doing everything correctly, you may still show a decrease in appetite, an improvement in well-being, a loosening of your clothes, and a slow but steady weight loss and reduction in inches. This simply means that you are not producing enough ketones to register on the LTS but enough to burn fat. Remember, the strips are tools; making them change color is not the sole object of the game.” (Dr. Atkins' New Diet Revolution, 2002.)

While the strips can be psychologically supporting by confirming that you are in lipolysis, and therefore burning fats for fuel, you don't have to use the strips to follow the diet. As long as your hunger is under control and you are losing weight and/or inches, you are burning fat.

What to Do if the Ketostix or Lipostix Aren't Turning Pink

If you're at the beginning of your low-carb diet and the ketone testing strips are not turning at least pink, first make sure that you are measuring for ketones at the same time each day.

If so, you might want to next check that you aren't making any of the typical Atkins Induction Diet mistakes. Also, make sure that it's been at least 5 days since you started Induction. You want to give yourself plenty of time to enter into the state of ketosis before you begin tweaking anything.

In addition, strictly measure out your salad and other carbohydrate foods to guarantee that you're eating not more than 20 net carbs per day. Many people overestimate their carbohydrates and calories, so using a diet scale to weigh your foods, like this food scale at Amazon, can help you accurately measure those carbs. 

You also might want to try cutting out tomatoes and onions. Both of these veggies are relatively high on the glycemic index, and Dr. Atkins said they can be problematic for a some people.

If none of those suggestions work to get the ketone testing strips turning pink, as a last resort, he also suggested that you try cutting down on the amount of protein you're eating. Recent scientific research shows that excess amino acids are rarely converted by the body to glucose, as was once thought, that conversion is a lengthy and difficult process. 

What typically happens is that amino acid oxidation goes up.

However, protein consumption can trigger a higher-than-average insulin response, and thereby, interfere with ketone production in protein-sensitive individuals. This is one reason why Nutritional Ketosis works beautifully for some people, while disappointing others.

If you're prone to secreting too much insulin, the body will dump ketones every time you eat protein, so stop eating protein for snacks and try reducing the amount you're eating to just cover your body's maintenance and repair needs. For most people, that's about 0.8 grams of protein per pound of lean body mass or 20 percent of maintenance calories for your ideal weight.

If you're doing everything correctly, then don't worry about what the ketone testing strips are doing.

Lipolysis heavily suppresses the appetite and cuts back on food obsessions, which can be a much better indicator that you have not been kicked out of ketosis than the ketone strips are.


  1. Not quite understanding what you're saying. Are you saying that Keytones trigger insulin release?
    Are you saying that urine strips showing purple that you may not be in ketosis?
    Hoe does glucose level in blood relate to ketones?

    1. Hi Diego,
      Sorry if I confused you. If too many ketones build up in the bloodstream, those ketones can trigger an insulin release. The ketones that spill over into the urine do not. There are 3 different types of ketones, and the body does different things with each type.

      If the urine strips are showing purple for you, you're most likely new to low carb? People who have done this before, don't generally show purple. They're more likely to turn the sticks lavender or even just pink, which makes it more difficult to determine exactly what's happening when they eat certain things. If the strips turn "any" color other than beige, then you're predominantly burning fats for fuel and most likely in ketosis, but not always.

      There's a small window where eating too many carbs can initially dump ketones into the urine to make room for incoming glucose. The body burns glucose first, rather than fats, so if you eat too many carbs, it dumps the ketones because it can't turn them back into body fat.

      If you test yourself at the moment the body is dumping those ketones, you'll mistakenly believe you're in ketosis when you're not. It's a good idea, when you start returning carbs to your diet or if you ate something that's suspect, to test yourself more than once, or wait a day or two before checking. That will give you a more accurate reading.

      For beginners, the ketone strips will show lighter and lighter shades of lavender as you add more carbs to your diet. That's normal, and gives you a good idea of how many carbs your body can tolerate. For some people, however, the sticks just don't turn any color at all, even if they are in ketosis. That's because the sticks only check for one type of ketone. The ketones that your brain uses are different.

      Ketones are a by-product of fat metabolism. As fatty acids you eat are processed or as body fat is pulled out of your fat cells and processed, ketones are a result of that process.

      Once your glycogen stores are emptied and you're in ketosis, When your blood glucose level drops too low, the body will make the glucose it needs to keep it steady from body fat. Body fat is 10 percent glycerol, which the body can turn into glucose. It can also turn certain amino acids into glucose, if necessary, but it doesn't take that much glucose to keep your blood glucose steady, as long as you're not eating a ton of carbs.

  2. Hi Vickie, you seem to understand this ketosis stuff quite well so maybe you can help me.
    I'm 51 year old female needing to losr at least 25lbs.
    I have been on a keto diet for almost 4 weeks. My keto strips are purple but I haven't lost a pound!
    I'tracking my macros and calories on my fitness pal and have been spot on.
    Carbs are less then 20g(5-10%), fat at 60-75% protein at 20-30%
    Calories 1200-1500
    Any explanation as to why I'm not losing?
    Frustrated lynn

    1. By keto diet, I'm assuming you mean Nutritional Ketosis? The actual Keto Diet doesn't use percentages. The whole concept of high-fat is misleading.

      Percentages are based on the number of calories you're eating. For that reason, they can be quite misleading, as well. Absolute grams are an easier way to track because for Nutritional Ketosis, part of your fat percentage has to come from your body fat stores. A diet of 75 percent fat is maintenance.

      Some people are able to lose weight on 1200 to 1500 calories, while others cannot. General rule of thumb is to start with 10 times your current body weight, in calories, and then adjust down from there, if needed. What you take away is always fat because it's really the only macro we have to play with.

  3. 50% correct, 50% wrong haha. But nice try.

  4. Your website is awesome thank you!

    1. Thanks. Glad to hear that you find this website awesome! I appreciate you taking the time to share your thoughts.