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Lumen review: a metabolism breathalyzer for the patient


For the previous 12 weeks, the very first thing I do once I get up is roll over, seize my $349 carb vape, head to the sofa, and start my morning measurement. I suck in a deep breath by way of this factor for 4 seconds, maintain my breath for 10 seconds, after which breathe out for six seconds. Just a few seconds later, the Lumen app on my cellphone tells me whether or not I’m burning fats, carbs, or a mixture of each. As soon as that’s carried out, it then spits out a custom-made plan for what I ought to eat that day.

Within the crudest phrases, Lumen is a metabolism breathalyzer and digital nutritionist rolled into one. The pitch is which you can learn the way effectively your physique switches between burning fat and carbs. Armed with that knowledge, you possibly can theoretically take a extra knowledgeable strategy to dropping pounds, enhancing your athletic efficiency, or enhancing your general metabolic well being. It sounds too good to be true for one system to do all three. These are three points that just about anybody would love to repair, and the numbers show it. Weight-reduction plan tradition alone is a $71 billion industry, whereas the health industrial complicated is value $30 billion.

How we fee and evaluate merchandise

I first reviewed this factor three years in the past, however I made a decision to revisit the system a couple of months in the past after Lumen reached out to say the product had undergone some main updates. That, and I’d simply royally botched the New York Metropolis Half Marathon. I do know now that race wasn’t meant to be, however on the time, I used to be satisfied I’d carried out one thing improper. Possibly I’d fueled incorrectly within the weeks main as much as the race. I don’t like leaving issues unexplored, and I’d already signed up for a 10K — why not take the Lumen for a spin and see if utilizing it may assist me run a greater race?

What’s new, the way it works, and science

Lots has modified since I reviewed the first-gen Lumen, however some issues are precisely the identical. Just like the design. Lumen despatched me its second-gen system, and I legitimately can’t inform the distinction. Once I requested Lumen, they mentioned the one change lies in among the inside parts.

The system is sufficiently small to slot in my hand, with a discreet energy button on the underside half. While you flip it on, a purple LED circle lights up. (It turns crimson when the battery is low and inexperienced whereas charging.) There’s a magnetic cap for the mouthpiece to maintain it clear, and also you get a dock for charging. I mentioned this in my first review, however whereas the dock is theoretically nice to your nightstand, there’s no level in placing it there. Nightstand actual property is treasured, and a single cost lasts weeks. Since setup, I’ve solely needed to cost this factor twice.

Many of the adjustments are within the Lumen app. It’s loads slicker than it was three years in the past, there are much more academic movies about vitamin, wellness, and health, and the meals database for macro logging is extra strong (although nonetheless inferior to Lose It or MyFitnessPal). You may even order premade meals by way of the Metabolic Meals service within the app.

However probably the most important change is you solely have to take one breath per measurement. With the unique, you needed to take three breaths to get your morning Lumen rating. Since you must wait not less than a minute between every breath, the morning measurement used to take two or three minutes at finest. And when you screwed one up, it was a complete drag. It’s loads much less painful and time-consuming now, even when you must redo a measurement.

You may take as many measurements as you want through the day, however an important one is the one you’re taking within the morning earlier than consuming or ingesting any meals. Lumen additionally recommends you’re taking a measurement half-hour earlier than and after consuming and exercises, in addition to a ultimate measurement earlier than mattress. Ain’t no one obtained time to take 10 measurements a day day by day, however as long as you’re taking your morning measurement, you may get a custom-made vitamin plan.

While you breathe into the system, it’s mainly on the lookout for how a lot carbon dioxide is in your breath. That’s then in comparison with gold-standard Respiratory Exchange Ratio (RER) tests. Within the app, you get a rating of 1-5. In case you get a 1 or 2, you’re largely burning fats. A 3 is a extra even mixture of each, and a 4 or 5 means you’re burning largely carbs. After 4 weeks, you’ll get a Lumen Flex rating, which gauges how effectively you turn between each gas sources. As to why it is best to care… it boils right down to optimization. For weight reduction and physique recomposition, maximizing the time you spend in fats burn is good. For athletic efficiency, carbs are quicker at offering your physique vitality, and also you need to make sure that your muscular tissues have sufficient glycogen to energy your actions.

An replace in June added extra granular breakdowns for Lumen scores. Now you can see the precise proportion of fats and carb you’re burning.

My objective was to enhance my working efficiency and construct some muscle, so I selected Lumen’s efficiency observe. You may, nonetheless, select weight reduction or common metabolic well being tracks as effectively.

April: a carb-filled studying curve

My mother mentioned no meal is full with out a bowl of rice, and I stand right here right this moment as an unapologetic carb lover. Additionally, anybody who’s ever tried to run a long-distance race with out carbs is aware of that bonking sucks. Coming off a half marathon straight into my birthday month in all probability explains why for the primary three weeks, my morning Lumen scores virtually solely alternated between 3s and 4s. And honestly, I didn’t put quite a lot of effort into lowering my carb consumption as a result of a birthday month with out plenty of cake and good meals is a travesty.

Even so, the Lumen app didn’t disgrace me — as many fitness-related apps and wearables are wont to do. As an alternative, it peppered me with factoids and quick movies with academic recommendations on vitamin, psychological well being, and how one can correctly use the Lumen. I used to be pleasantly stunned to search out Lumen features a complete information to portion sizes, macronutrients, and recipe recommendations. The vast majority of the recipes cater to a Western palate, however spending a while going by way of the app’s academic supplies ought to provide the constructing blocks to navigate all types of cuisines.

The app takes a extra nuanced strategy to weight reduction, however it is best to nonetheless seek the advice of a healthcare skilled when you’ve struggled with disordered consuming.

Whereas exploring the Lumen app, I used to be relieved to see the general focus was on making gradual, regular adjustments to your life-style quite than fast outcomes. Ideas included alternate options to the size in measuring progress, methods so as to add to your weight loss program as a substitute of proscribing, and urged strategies for constructing a sustainable train behavior. I a lot want this strategy to restrictive diets and an emphasis on calorie deficits. Not solely is it extra forgiving when life will get in the best way, however it’s much less reliant on motivation and willpower.

That mentioned, I don’t suggest utilizing Lumen for individuals fighting or newly recovering from disordered consuming with out consulting a healthcare skilled. Though Lumen takes thought and care into how this info is introduced, I may see how somebody may misuse Lumen to perpetuate disordered consuming or obsess over measurements.

Honestly, I didn’t see a lot, if any, progress in my coaching throughout April. My instances had been gradual, I used to be simply fatigued, and my calves had been perpetually screaming. Just a few weeks in, I had a check-in with a Lumen nutritionist to debate a sport plan and methods to enhance. (This 1-on-1 steering isn’t explicitly out there to Lumen clients, although you possibly can simply message help with questions from the app, and Lumen has a Facebook Group.) Many of the dialogue reaffirmed what I already knew — eat the majority of your carbs earlier within the day, entire grains are a very good carb supply, and there’s at all times room for birthday cake. However I did study a couple of good ideas for sneaking further protein into my meals — like swapping common pasta for protein pasta — and that, for my life-style, I should strive early morning exercises.

Whilst you can put the Lumen in your nightstand, the cost lasts so lengthy it’s sort of a waste.

Wanting again, April was extra about getting the grasp of this entire Lumen factor. Some adjustments — like consuming dinner earlier than 11PM — took me weeks to do sustainably. Earlier than making tweaks to my weight loss program, I needed to perceive my present weight loss program. By week 5, I began seeing minor enhancements in my morning scores. All this to say, Lumen is just not a system that delivers fast outcomes — nor does it declare to. It takes 4 weeks of constant use to get a Lumen Flex rating! That’s annoying in a world that runs on immediate gratification, however it’s not less than trustworthy.

Might: meal logging is a ache

By Might, I didn’t actually suppose too onerous about my morning measurement. I grew to become a little bit breath-checking robotic. It helped that I may double-tag my morning measurements. It’s delicate, however with the ability to tag my morning measurement as a pre-workout studying, too, helped get me into my trainers and out the door. You can even tag measurements as pre-breakfast and post-fasting. That allow me begin specializing in following Lumen’s every day vitamin plans.

Since I selected the athletic efficiency observe, the app gave an formidable protein objective of 120g per day and a reasonable fats objective. Carb targets fluctuated daily. Some days had been low-carb days; others had been medium-carb days. Others but had been high-carb “enhance” days. It’s successfully guided carb-cycling. I did my finest to stay to the plans, however it wasn’t what I’d name simple.

One other replace is which you can now get steering on when it is best to plan to eat your carbs.

For starters, 120g of every day protein is a lot. I usually common round 50-70g and don’t eat quite a lot of meat. I began ingesting every day protein shakes to get most of the best way to 120g however not often achieved it. On the plus facet, I’ve additionally now obtained a small database in my mind of protein-rich snacks and toppings that I can add to meals to get an additional enhance. I additionally didn’t succeed at having low-carb days. I attempted, however conserving my carbs to 75g was too troublesome for me, famous carb lover. The app provides 15-30g to the full when you train for not less than 30-40 minutes, however even that was robust.

And whereas monitoring meals was simpler than once I first reviewed Lumen, it’s nonetheless tedious. You may scan barcodes now, however newer or worldwide merchandise don’t at all times present up. In these situations, you must manually enter them, and that’s a special sort of tedious if you must do it a number of instances per day. I’m not a math whiz, and the very last thing I need to do is convert serving sizes on vitamin labels to what I really ate, solely to search out the app tracks servings in a completely totally different unit of measurement. It was a lot simpler to hyperlink Lumen as much as HealthKit (or Google Match for Android customers) after which log meals within the Lose It app, which helps you to import recipes from meals blogs, scan barcodes, and has a bigger user-generated database. The meals themselves don’t present up, however the every day macros do — and that’s an important half.

I’ll cop to being horrible at meal logging. For me, it makes consuming really feel like a chore, and it’s by far my least favourite a part of utilizing Lumen. That mentioned, it’s kinda crucial that you simply do it to get probably the most profit.

Out of curiosity, I ordered some Metabolic Meals by way of the app. There are many choices to select from, all of which have been vetted by Lumen’s head of vitamin. You do should order by 10AM ET on Wednesdays if you’d like meals the following week. In any other case, you’ll have to attend 10 to 14 days, which was what ended up taking place to me.

There are professionals and cons. On the one hand, it’s so handy. Growth, there’s a meal within the fridge that I can pop into the microwave and simply log by scanning the barcode. It took the guesswork out of what I ought to eat and ensured I wouldn’t order takeout if I didn’t really feel like cooking. In case you don’t end all of the meals inside a sure week, then you possibly can stick them within the freezer. Plus, there’s no subscription, so that you’re not obligated to order each week or month like you might be with providers like Blue Apron or Inexperienced Chef. Style-wise, they had been tremendous, however — to not toot my very own horn — I’m a greater prepare dinner.

The principle con is it may be costly. Lumen gave me a code for 14 meals, however every meal prices someplace between $10-$15, with the majority at round $12-13. The minimal is eight meals per order, so on common, you’re going to spend not less than $100. In case you order eight lunches and dinners for the month? Then it is smart, and also you’re in all probability saving cash that you’d’ve spent on takeout. It will get means costlier when you’re ordering this for 2 meals a day, seven days per week.

I did finest with Lumen throughout Might, however backsliding a bit in June didn’t actually derail me. In 12 weeks, I solely forgot to take a studying on 5 days.

I’ll by no means ever like meal logging, however I gained’t lie: I obtained outcomes from doing it. Nothing main. My run instances improved ever so barely, I had extra vitality whereas working, my weight remained steady, and I used to be persistently waking up early. My Lumen Flex rating shot up, and most days, I wakened with a rating of 1 or 2. I had one other follow-up with Lumen’s nutritionist forward of my race, and mainly, I used to be doing all the precise issues. The enhancements had been modest, however I’m additionally somebody who was already doing most of what Lumen advises.

June: race day outcomes

I used to be happy with myself for sticking to it for all of Might, however I fell barely off observe within the two weeks earlier than my race on June seventeenth and after. Life occurs, and circumstances past my management impacted my sleep, which in flip impacted my coaching, which in flip made me much less inclined to diligently observe my macros. My Lumen scores began creeping as much as 3s and 4s, my Flex rating dropped, and I even forgot to take my measurements for a three-day stretch.

Despite the fact that I began backsliding, I nonetheless did the naked minimal with Lumen 90 % of the time. Other than these three days, I nonetheless took readings each morning and earlier than / after exercises and threw macro logging to the wind. I didn’t discover that a lot of a change in efficiency, and this was loads simpler than monitoring each meal. I used to be primarily treading water, however I felt spry sufficient on apply lengthy runs that it was a tradeoff I felt tremendous making.

The carrying case is a should when touring. I additionally simply hold the Lumen in its case once I’m not utilizing it.

Going into the 10K, I made a decision to not have a time objective. The one objective was to benefit from the run as a lot as I may and, hopefully, really feel good. I did superb for the primary half of the race earlier than dropping most of my steam at mile 5. And though I didn’t have a robust end, had it not been for a very timed rest room break at mile 4, I’d’ve PR’ed. Was it a clear-cut win? No. Nevertheless it was measurable progress; I completed what I got down to do and went residence feeling good.

For the tortoises, not the hares

The TL;DR of this entire story is that I attempted Lumen and improved a tiny bit after months of worsening efficiency. Had been I to proceed utilizing Lumen, I think about I’d hold enhancing little by little till I hit a plateau. At that time, I’d strive one thing new and finally break that plateau. Then, the cycle would repeat till I’m six toes below. Whether or not it’s well worth the funding depends upon how affected person you might be.

That is higher suited to of us who don’t thoughts a gradual and regular course of.
Picture by Victoria Tune / The Verge

Since I final reviewed this system, Lumen’s switched to a subscription mannequin. It’s $249 for a three-month plan, $299 for a six-month plan, and $349 for a yearlong plan. That’s roughly $83 a month for the three-month plan, $50 a month for the six-month plan, and $30 a month for the yearlong plan. The {hardware} comes “free,” and also you get a 30-day money-back assure. I don’t love subscriptions, however they’re par for the course in health and, increasingly, life.

If you’d like fast, dramatic outcomes, I don’t suppose Lumen is an effective match. Until you’re simply beginning out in your well being journey, your positive factors will in all probability be modest. However let’s say you might be an absolute newbie. In that case, Lumen is a wonderful academic software, and selecting one of many shorter plans is sufficient to construct a very good basis. For everybody else, it’s a matter of whether or not you imagine that gradual and regular wins the race. I do, and so for me, it was value it.


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