What Is Keyto?
For those considering the ketogenic diet, Keyto is a device designed to give you instant feedback on the amount of acetone in your breath so you can monitor whether your body is in ketosis.
This handheld device pairs with an app to help you make dietary decisions that keep you in ketosis and potentially losing weight.
In this review, we’ll talk about how to use Keyto, what a ketogenic diet is, how the Ketyo app works as well as how it compares to other testing methods and what customers say about their app experience.
We’ve included the insight we gathered from an interview with Keyto founders Dr. Ethan Weiss and Dr. Ray Wu.
How Do You Use Keyto?
When you commit to Keyto, you will receive a lightweight device (the company claims it weighs less than an ounce) that looks and acts similarly to a breathalyzer.
The Keyto runs on one AAA battery that the brand states will last for more than 600 breath tests. Each purchase also comes with four interchangeable mouthpieces and a carrying case.
Keyto works by measuring the levels of acetone in your breath to give you a sense of how much fat you are burning. Acetone levels increase when a ketogenic diet is done right, which we’ll cover in the next section.
Says company founders Weiss and Wu, “Every Keyto has a proprietary nanosensor that detects acetone, a biomarker for fat metabolism, on the breath of users. The more acetone on one’s breath, the more fat they are using for fuel.”
The reported numbers range from one to ten, and the higher the number you score, the further into ketosis your system is.
Below is the Keyto range for ketosis as the company defines it:
- Level 1 – Not in ketosis
- Level 2 – Starting Ketosis
- Level 3-5 – Increased fat burning potential
- Level 6 – High fat burning potential
- Levels 7-9 – Extreme fat burning potential
- Level 10 – Deepest level of ketosis
In this way, you can track whether you are in ketosis in real time and finetune your diet as necessary to maintain progress.
To use the device, you need to breathe into it as long and powerfully as you can, similar to how you would use a breathalyzer.
It will then sync with the Keyto app to display a score from one to ten, with higher scores meaning you are deeper in ketosis. Your overall goal is to keep your Keyto number as high as possible for as long as possible. This ensures that you stay in a prime fat-burning state.
The company suggests taking the test 1-3 times per day when you first start using it, preferably first thing in the morning so that you form a habit and can monitor your baseline over time. For the most accurate results, it’s important to breathe out for a similar length and intensity at every testing time.
About the Keyto App
The Keyto app is available for both Android and iOS devices, and it integrates with the Keyto device to give you real-time feedback on your ketone levels. The app also provides meal plan suggestions and a food guide to help you make keto-approved choices at the grocery store and while eating out.
We found that these guides provided a comprehensive overview of the ketogenic diet, and like that it offers a search feature for more easily finding specific foods.
We also appreciated that the app provides ordering guides for a variety of chain restaurants, including Starbucks, Taco Bell, Panera Bread, and others. In some cases (as with Pizza Hut) the app suggests avoiding the restaurant altogether.
The Keyto app is set up to allow you to track your acetone levels over time so that you can monitor how long your body has been in ketosis and see how that correlates with your weight loss journey.
It’s also possible to join groups through the app to gain support and share your progress with other Keyto users.
What is the Ketogenic Diet?
As we previously laid out in our comprehensive beginner’s guide to the ketogenic diet, this eating strategy is low-carb, high-fat, and moderate-protein, and the primary goal is to starve your body of the carbohydrates it typically relies on for fuel.
This causes your liver to instead turn fatty acids into ketone bodies, which provide a clean, efficient energy source for your brain and body. Ketogenic enthusiasts report that this leads to weight loss and better energy levels throughout the day.
The ketogenic diet is defined by what you can and can’t eat. Permitted foods include olive oil, low-carb nuts, avocados, meat and poultry, cruciferous vegetables, and all forms of cheese. You’ll need to cut sugary and starchy products from your diet, including bread and pasta, bananas, apples, potatoes, rice, and all forms of refined sugar.
According to the AFPA (American Fitness Professionals and Associates), the diet was initially created to treat epileptic children. While it’s still used to alleviate seizure symptoms, the eating strategy has surged in popularity for the general population as a way to lose weight.
Saying that, the diet has some dissenters. In our article on the ketogenic diet, Dr. Annthea Fenwick, an exercise physiologist who has worked with members of the US Olympic team, told us that it isn’t one she recommends to patients.
That’s both because she believes it doesn’t have a thoroughly proven scientific background and because she doesn’t think fat is an efficient fuel source for the body, especially compared to carbohydrates.
She notes following the diet long-term could lead to problems, especially for athletes who perform high-intensity exercises.
The key to following the ketogenic diet is keeping your body in ketosis for as long as possible to maximize fat burning.
Traditional ways to check whether you are in ketosis include blood tests and pee strips. Keyto promises a more convenient solution with their ketone breath analyzer.
Keyto Verse Blood Tests and Ketosis Strips: What’s the Difference?
Keyto isn’t the only device that lets you monitor your ketone levels, but the company claims it is the most convenient. Today, most people rely on blood tests through finger pricks and urine strips to see whether they are in ketosis. Should you consider these methods instead?
While your preferred testing method is a personal choice, one thing to keep in mind is that these methods tend to be single-use, meaning that you will need to buy urine strips regularly to keep testing your levels.
Likewise, some people might appreciate how much less invasive it feels to blow into a tube than it is to measure their bodily fluids.
Another factor is that urine testing is considered to be less accurate than blood or breath and that the accuracy goes down the longer you are on the diet because your body adapts to the change and excretes fewer ketones.
While HVMN shared that blood tests are the preferred way to measure ketones today, breath testing is relatively new to the market, and they state that more research is needed to determine how it compares in accuracy.
How Much Does Keyto Cost?
At the time of writing, the Keyto device is sold exclusively through the company website and is available at multiple tiers of membership.
You can pay $249 for an unlimited lifetime membership, which gives you long-term access to the device and company app. It’s also possible to purchase twelve month or six-month membership packages that cost $10 per month ($120 annually) or $15 per month ($90 biannually).
If you wish to contact the company directly for more information about their pricing and return policy, you can do so at email@example.com.
What Do Customers Think of Keyto?
Though the Keyto device was new at the time of writing, we found online reviews for the app we felt were worth considering.
The Keyto app earned 2.6 stars after 37 reviews on Google Play. The biggest critique we noticed was that the app struggled to connect to the device and that it was glitchy when it loaded.
Many people noted that they couldn’t access the supplementary material on the ketogenic diet, and others reported that it often crashed. A few people stated that they didn’t think the device was accurate, as they occasionally blue high numbers (4-6) after eating carbohydrates earlier in the day.
Others wrote that they thought the device worked as described and that the accompanying app helped them stay motivated to stick with the keto diet and that it helped them determine which foods were permitted in a pinch.
Our View: Should You Consider Keyto?
From this research, do we think that Keyto makes sense for those following the ketogenic diet?
The product founders shared with us that they want Keyto to be an all-encompassing system, meaning that someone who doesn’t know anything about the ketogenic diet could buy the device, download the app, and get started right away.
We think Keyto delivers on this goal, as the product’s app offers a comprehensive overview of how to follow the eating strategy and it includes shopping lists, meal planning suggestions, and even fast food eating guides.
The negative reviews we noticed were based primarily on the app being buggy while in the early stages of development, so it’s reasonable to expect that these issues will improve over time.
If you’re looking for a convenient way to track your time in ketosis, it’s hard to argue against breathing into a tube when the other alternatives are testing urine or blood. Likewise, you might save money over time by not buying single-use testers.
Whether or not the ketogenic diet makes sense for you from a health perspective is a different question, and it’s one with a nuanced answer. We recommend starting your research process with our comprehensive guide to the ketogenic diet.
Just get the blood test
Awful. The product is a cheap, $1 piece of plastic with a battery that is sold for 100 times more. Very inaccurate compared to a blood test or even pee strips. Besides inaccuracy, the company has released the product with billion bugs and limitations. If you ever log out of your profile - you gotta get a new Keyto. If you create a new profile - you gotta get a new Keyto. Absolute waste of time, health, and money.
Bottom Line: No, I would not recommend this to a friend