The Bodyscan website and, more importantly, the booking pages that ask for your personal information and credit card details are now SSL-secure.
That means all data passed between your browser and the booking engine web server are encrypted and remain private. You can see this marked by the HTTPS (rather than just HTTP) at the front of each page's URL in your web browser.
Due to some software restrictions, we've had to take the booking engine (made by Australian company Bookeo) out of Bodyscan's own website and host it on its native site. It's exactly the same engine and works in exactly the same way but is no longer embedded as a widget on the Bodyscan booking page.
The upshot is that when you book a Bodyscan DEXA body fat test you can be sure your personal and credit card details are completely safe.
If you've been to Bodyscan for a DEXA scan then you can use the Bodyscan body composition calculator to set targets for fat loss, muscle gain or both.
After entering the data (in kilograms, not grams - therefore your bone mass (BMC) will be between one and four kilograms) from your DEXA Bodyscan report on the first (RMR) page (which gives you two formulae's outputs for your resting calorie requirement), you can advance to the Body Composition Calculator, which allows you to set targets for fat and lean mass, using your fat mass index (FMI) and lean mass index (LMI).
To arrive at FMI and LMI targets, you'll want to use the Bodyscan percentile tables (latest update December 2017), which you can see on our Data Page and are also at the back of your printed explanatory notes (download notes here).
The tables in the explanatory notes are for clients of all ages and the numbers hold very well up to age 50. On our Data Page the tables have been split into age bands and you can view and download these too.
Using the 'All Ages' data, you can see from the blue (male) tables, that the median (50th percentile) score for male FMI is 5.79 and the median LMI is 19.3. The orange (female) tables show medians of 7.62 and 15.5 respectively. (These figures have been updated as of December 2017).
If you're already carrying more fat and/or less lean mass than the average Bodyscan client, you might want to use these median values as initial targets for FMI and LMI.
On the body comp calculator you can move the fat and lean slidebars until your FMI and LMI (on the left of the page) reach or come close to those targets. You'll then have (immediately above the slidebars) the absolute amounts, in kilograms, of fat and muscle you need to lose/gain. You'll also see your projected change in weight - which might even be zero.
If you're better than the Bodyscan client average, you can set your targets to be the top quartile or top 10%.
The FMI and LMI targets come with a caveat - the Bodyscan client data does not represent a random sample of the UK population; they are self-selecting Bodyscan clients and they contain a range of ethnicities. Nevertheless, they are a very good starting point to set a tangible, achieveable target.
The opening episode of Doctor in the House airs at 9pm on Thursday 19th November and follows Sandeep and his family after his Bodyscan DEXA scan reveals he has high levels of visceral fat.
We have no idea what the final edit will look like but we hope it will raise awareness of the benefits of DEXA fat testing. The BBC programme guide is here (click 'show more' for the full description).
One of the questions I get asked most often (by men) following a DEXA scan is: “what percentage body fat do I have to be before I see my abs?”
One of the commonest rule-of-thumb responses is ten percent. But like a lot of stuff to do with the body, it depends.
Look at this scan report for Dave, who has put on both fat and muscle in 12 weeks and now stands at 17.2% fat (subtotal). Moreover, he is 17.5% fat in the trunk and 20% in the belly (android) region. But the photos above show he has respectable (certainly noticeable) abs at the front despite being able to pinch at least an inch at the side.
Compare that to Peter, whose progress we have charted before and whose DEXA fat figures are just 13.7% (subtotal), 13.1% (trunk) and 16.1% (belly) and whose abs remain elusive (sorry, we didn't take a photo).
Dave says he’s just blessed with good, thick abs and works them hard by adding weights to exercises such as hanging leg lifts and incline crunches. He's not in the camp that believes abs don’t need their own workout; he will usually train them hard twice a week.
A quick look at the pair’s respective lean mass index (lean mass divided by height squared in the Lean Indices table on the first page of each report) shows up significant lean mass/muscle differences: 23.6 for Dave, 21.5 for Peter. That 2.1 is a big difference for an index where 19.5 is average and 25 is steroid territory.
Further, relying on body fat percentage doesn’t really make much sense because it’s just an average over your entire body. You might carry your fat atypically. And you can have a low percentage (or proportion) of fat but still be carrying a lot of it in terms of kilos. That's what your fat mass index will make clear.
So it seems that to see your abs you need one or more of: a low FMI, low percentage fat, high LMI, a good ab routine and genetic luck!
Between January and August (2015), more than 350 men and 150 women came for a DEXA scan at Bodyscan’s London location.
The aggregated results are available here and show something quite interesting. The median value for fat mass is almost identical - 16.8kg for men and 17.3kg for women.
Of course, women are typically lighter than men so 17kg of fat will equate to a higher body fat percentage for women. Indeed, the median weight and fat percentage for Bodyscan clients turned out to be:
Men: 83kg weight, 21.8% fat*
Women: 63.1kg, 30.1% fat*
It’s important to remember that Bodyscan clients are not a random sample of the UK population; they have elected to have a DEXA scan for whatever reason (fitness or fat loss) and are probably geographically close to London. The data also include a broad range of ages (the median age is 36 (men) and 35 (women)).
However the approximate 17kg for median fat mass for both sexes is, if nothing else, quirky!
*Note: The data points in the data tables should be all read independently of each other - one should not expect to be in the same percentile for all data points. That’s why the median figures above (21.8% of 83kg for men and 30.1% of 63.1kg for women) do not produce the median fat mass figures of 16.8kg and 17.3kg.
Returning to Bodyscan after 13 weeks, Lee, 46, has lost an incredible 8.5kg of body fat with NO loss in lean mass - in fact he’s GAINED over a kilo of muscle!
Download the main pages of Lee's Bodyscan report here.
He did it all by himself, following Mike Matthews’s Bigger, Leaner, Stronger programme, which has him lifting five days a week, hitting each major muscle group for about an hour each day plus some high-intensity interval training (HIIT) on the two rest days. His diet was 45% protein, 45% carbs and 10% fat, a customised meal plan provided by Matthews’s Muscle for Life website.
Lee’s Bodyscan DEXA report reveals he has lost fat pretty evenly. Before, his body fat percentage was higher than that of three-quarters of men his age. Now, he's turned the tables and moved from the bottom quarter to the top quarter!
The highlights of Lee’s journey so far are:
If you want to see what your own body fat percentage would be if you lost 8.5kg or how much fat you have to lose to meet a specific fat percentage target, take a look at our body composition and calorie requirement calculators.
To understand DEXA we need to understand a little about how X-rays work.
Traditional X-ray machines work by passing X-rays of a single energy through the patient’s body. The X-ray photons either pass through unaffected or they are ‘attenuated’ (absorbed or scattered) by the body.
The degree of attenuation (ie, how many photons pass through and how many are absorbed by the patient) depends on the thickness of the subject and, for a given thickness, on the density. Thicker and denser materials (like bones) attenuate X-rays more than thinner or less dense ones (like soft tissue).
For the simple identification of broken bones (when all that is needed is an image of the bone), single energy X-rays are all that is required.
To provide data about bone density, however, a problem arises because some of the X-ray attenuation is caused by the soft tissue surrounding the bone. An algorithm behind a single energy X-ray cannot be used to calculate the thickness of two unknown quantities (bone and soft tissue).
Fortunately, X-ray attenuation is also affected by the energy of the photon beam – the higher the energy, the lower the attenuation. By measuring attenuation based on both energy and subject thickness, the software algorithms behind dual-energy X-rays can use two simultaneous equations to calculate the thickness/density of both bone and soft tissue.
Further, since soft tissue is made up of fat and non-fat and if the density of fat is known (approximately 0.9 grams per cubic centimetre) then the mass of fat and fat-free (lean) tissue can be calculated, along with bone mass.
This essentially is the calculation behind DEXA (dual-energy X-ray absorptiometry) body composition measurement.
Accordingly, DEXA is referred to as a 3-compartment model, simply meaning that it measures the density of three components – bone, fat and fat-free soft tissue – to calculate their mass.
When I give a consultation, and in the explanatory notes that every Bodyscan client receives, I read fat and lean mass to the subtotal line in the DEXA report and ignore the head.
There are three reasons for that:
1. We’re really not interested in the head, face and brain when it comes to body composition.
2. DEXA makes some assumptions and estimates about brain fat and because the skull is an encased piece of bone.
3. If you’re tall we have to leave either your head or feet off the end of the table (and we’re much more interested in your feet!)
Bodyscan uses Hologic scanners in all it sites. The other chief manufacturer of DEXA body composition scanners, GE, does not include the head anywhere in the analysis.
It’s fair to say that omitting the head does create some inconsistencies in relation to other data on the report. For example, your fat mass index (fat mass/height-squared) and lean mass index (lean mass/height-squared) are calculated using the total figures. Also, your rate-of-change page that shows your progress in subsequent scan reports also plots changes in total numbers.
Of course, you can include the head and read the report that way, but for fat mass, lean mass and body fat percentage, we will read to the subtotal line and ignore the head.
On the front page of your Bodyscan report is a small table titled Lean Indices. There are two indices based on your lean mass here:
1. Lean mass/height-squared - Lean Mass Index (LMI)
2. Appendicular lean/height-squared – Appendicular Lean Mass Index (ALMI)
First of all, lean mass on your Bodyscan DEXA report means all lean tissue, or all soft tissue that’s not fat. Thus it includes internal organs but does not include bone. (Lean+BMC is lean plus bone, ie everything that’s not fat.)
Whilst your lean indices are not just about muscle, they give us a good indication about muscle mass and how it’s distributed.
Your LMI relates to all the lean tissue in your whole body, while your ALMI is just about the lean in your limbs (your arms and legs).
A simple way to make sense of how high or low your lean indices are is to check your percentiles in the ‘AM’ column to see how you compare to a population of the same age and sex. An AM percentile above 50 means that you have a higher lean index than most people your age and sex. A bodybuilder will typically have AM percentiles in the 90s (ie, an indication of more lean mass than just about everyone his/her age).
If the AM percentiles for LMI and ALMI are close together then it suggests that lean mass (and therefore muscle mass) is evenly distributed around the body. If they’re far apart (eg, an AM percentile of 50 for LMI, and an AM percentile of 75 for ALMI), this suggest that the muscles in the trunk are less well developed than in the arms and legs. It’s like scoring 75% in a French (limbs) exam but only 50% in a French & German (limbs + trunk) exam. Clearly, your German (trunk) is dragging you down. So go and work on that German trunk!
On your Bodyscan DEXA report there more numbers you don’t have control over than those you do.
When it comes to fat, these are the Total and Subtotal results for
1. Fat mass
2. Fat percentage
3. AM percentile
4. YN percentile
5. Fat mass index (fat mass/height^2)
6. Estimated visceral fat (mass, volume & area)
You don’t have any control over the fat numbers for:
4. Android region
5. Gynoid region
6. Android/Gynoid ratio
7. %Fat trunk/%Fat legs
8. Trunk/limb fat mass ratio
The reason is that you cannot spot-lose fat; you can’t control where it's stored and where it comes off. To lose fat in your legs or to change you’re A/G ratio you just have to lose fat. Period. Your body will decide where it melts away and where it sticks around.
Lean mass (muscle) is a different story. You can of course target muscle groups in your arms, legs and trunk to make specific gains in these areas.
Bone density is something you can increase by doing weights and resistance training and with a good diet that includes calcium. I have seen a number of young male clients recently with low full-body bone density Z-scores. All of them said they did not like milk. Go figure. One of them was a guy in his mid-30s who’s full-body Z-score was minus three (-3.0). That is the lowest I have seen and lower than most 90-year-old women. And he knew it from a DEXA scan two years previously.
We’ve recently introduced two new packages designed for those serious about improving their body composition and regularly tracking fat loss and muscle gain over the course of a year.
The two new V4 and V5 packages contain, respectively, four and five scans designed to be taken every 3-4 months over the course of a year as follows:
V4 example 1: January, April, July, October
V4 example 2: January, May, September, January
V5 example: January, April, July, October, January
Measuring your body composition regularly will keep you on track and ensure you’re not losing any hard-won gains.
The first scan in each package comes with a consultation and are valid for a year. Thus, do not buy these packages if you plan to get scanned less frequently than every 12-16 weeks.
You make great savings compared to buying the scans separately and can pay monthly to spread the cost as follows:
V4 package: £399 (save £177)
Easypay price: £39 per month for 12 months (total £468, save £108)
Click here to set up your direct debit for a V4 package
V5 package: £499 (save £216)
Easypay price: £49 per month for 12 months (total £588, save £127)
Click here to set up your direct debit for a V5 package
The V4 and V5 packages are available in London and Manchester but not Bury St Edmund’s.
I meet many Bodyscan clients who tell me they want to lose weight or they need to get down to a certain weight or that their ‘ideal weight’ is such-and-such.
It’s usually at this point that I deliver a little lecture, whose tone varies between politely mild to … shall we say … passionate!
Let’s be clear about this: unless you’re a boxer or a jockey or compete in a sport that requires you to be a particular weight, NOBODY NEEDS TO LOSE WEIGHT!
On the other hand, almost everybody needs to lose fat. As I wrote in a recent advertorial for Guardian newspaper supplement Obese Britain, the UK obesity crisis that costs the NHS alone more than £5 billion a year has got nothing to do with people being too heavy. It’s because people are too fat.
I had one client recently who, despite being a crossfitter for five years or more, kept saying he needed to get his weight down.
“Rubbish,” I said. “If you lost 2kg of fat and put on 3kg of muscle, would that be a good result for you?”
“Of course,” he replied.
“But you’d be a kilo heavier than you are now. You’re weight would go up.”
I could see the cogs inside his brain turning slowly as he began to realise the earth wasn’t flat any more.
Your weight is your relationship with gravity and that’s about it. As for BMI (body mass index), don’t get me started!
Almost everybody who comes for a DEXA body fat scan wants to know their body fat percentage. In fact, I would say that is far and away the one single figure they want to know.
But percentage body fat, while a valid measure and data point to have, is not necessarily the best – and certainly not the only - measure of fat.
Why? Because body fat percentage is simply a comparison of fat to non-fat. In isolation it doesn’t give any indication of HOW MUCH fat you’ve got, only the proportion that is fat COMPARED TO EVERYTHING ELSE.
A better number, or one to use in conjunction with your fat percentage, is your fat mass index (FMI), which is your total fat mass divided by your height squared.
The strength of your fat mass index is that it is based purely on the absolute amount of fat in your body. If your FMI goes down, it means you have definitely lost body fat. And, conversely, if you lose fat your FMI will definitely fall. It’s a two-way relationship.
You can’t say that about your body fat percentage. You could lose fat and your body fat percentage could stay the same or actually go up. How? If you lose more muscle than fat, that’s how (as has happened with one unfortunate client).
Your fat mass index, however, is related purely to fat mass AND it is independent of muscle mass. If you stack on a few kilos of muscle but your body fat remains unchanged, your FMI will stay the same. It only moves if the amount of fat you carry changes.
Take a look at this real life Bodyscan bodybuilding client. His body fat percentage (subtotal, without the head) is 15.1% and his age-matched percentile is 3. That means only 3% of men his age have a lower body fat percentage. That great number is achieved because so much of him is muscle (ie, the proportion of his fat to everything else is very small).
But his fat mass index, at 5.13, achieves an age-matched percentile of only 25, ie a quarter of men his age have a lower FMI.
Why? Because FMI takes into account the actual amount (mass) of fat he’s carrying. And when we take into account his height, that fat mass is not quite as amazing as his percentage body fat.
So don’t obsess about your body fat percentage. Read it in the context of other fat and lean mass indicators.