Body Volume Index To Replace BMI?

BVI (or Body Volume Index) was recently launched as a new measurement of body size/shape designed to eventually replace BMI (Body Mass Index) as a way to assess obesity and heart health risk factors. 

For decades BMI has been the industry standard for determining if a person is at a healthy body weight.  BMI categorizes each of us as underweight, normal weight, overweight, obese, or morbidly obese based on whether our weight is appropriate for their height.  While this has been a healthcare standard, BMI has many detractors due to its limitations.  Although BMI provides an easy-to-use tool, it is unable to account for weight distribution and body composition.  This can lead to many people, especially athletes being categorized as overweight or obese due to their level of muscle mass.  Other measures of obesity have been proposed such as waist-to-hip ratio, which many healthcare professionals believed offered a more accurate assessment of body composition than BMI.  However, it appears that BVI has come to the forefront of new body size assessment tools.

BVI is measured using a 7-foot white light scanner into which a person walks to be measured.  A person's body image is scanned using a 3-D camera system with data from the scan being generated and saved into a computer system, which can calculate body volume as well as hundreds of other measurements including BMI, waist size, and waist-to-hip ratio.  According to the BVI website, the scan takes approximately 6 seconds and does not use radiation or lasers.

For validation of the BVI system, a major research collaboration, the Body Benchmark Study, was conducted at several research centers in the UK, Europe and the U.S. with the U.S. tests being conducted at the Mayo Clinic.  Results of these clinical trials indicated that:

• BVI can accurately measure abdominal volume as a proportion of the whole body, giving an accurate assessment of central obesity, a major risk factor for a number of chronic health conditions.
• BVI is able to detect differences in body shape and weight distribution in individuals with the same body mass index.
• BVI measurements were shown to strongly correlate to heart health markers, suggesting that BVI might prove to be an accurate way to determine a person's risk for poor heart health.
• BVI is an accurate and reliable tool to measure a person's obesity-related body characteristics such as waist size and hip size.

Based on these research studies, the BVI can be used to objectively track a person's body changes over time, reduces time and error inherent in manual measurements, and by using person-specific medical data can generate a health risk indicator.

This is a fascinating and important new development in obesity-related healthcare.  This new system, should it become accepted by the medical community, has the possibility to provide new, more accurate ways to assess body shape, size, and obesity and associated health risks.  This allows a very personalized approach to healthcare and intervention strategies to reduce one's risk for numerous chronic health conditions.  While BVI appears to have many benefits, it is system that has to be used in a physician's office and it is unclear how quickly it will appear in hospitals and private practices.  In the meantime, simple measurements we can all do, like BMI (18.5 - 24.9 is a healthy BMI range) and waist-to-hip ratio (0.8 or below for women and 0.95 or below for men), can help us aim for healthy body weight goals.

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De-Stress To Fight Body Fat

Stress... we are all subject to it.  We live in a fast-paced world that includes many daily stressors such as traffic snarls, discord in families, financial problems, illness, employment worries and more.  Unfortunately, stress can potentially lead to all kinds of health-related issues.  Stress has also been implicated in weight gain.  While we each handle our daily stress in our own particular way, some individuals find comfort in food, particularly high-fat foods.  Research suggests that chronic stress can alter metabolism and appetite hormones, which can lead to altered eating behaviors.

A new obesity research study explored this phenomenon further.  For this study, adult female rats were fed either a regular chow diet or a high-fat diet and exposed to either their stress-free home environment or exposed to chronic variable stress for 4 weeks.  The results of this study showed that:

• Animals fed a high-fat diet, regardless of their environment, gained weight, total body fat, and abdominal body fat.
• Body weight gain in stressed rats eating either the chow or high-fat diet was similar to unstressed rats fed the chow diet.
• Rats exposed to chronic stress and fed a high-fat diet became more fat, despite not having a different body weight compared to control rats.

These are interesting study results due to discrete differences in how the animals responded to high-fat diets and chronic stress.  First, a high-fat diet on its own, as one might expect, led to a gain in body weight and a gain in body fat.  In comparison, stressed rats fed a high-fat diet did not gain any more body weight than control rats, but became fatter.  The authors of this study suggest that chronic stress appears to increase the number of calories burned, keeping body weight gain similar to the control rats.  Despite this, stressed animals had altered levels of some hormones and a preferential increase in body fat.  Therefore, while stress might not always cause us to gain weight, it might cause us to gain body fat.

Minimizing the amount of daily stress to which we are exposed might be one way we can reduce our risk for overeating and obesity.  While there are probably hundreds of ways to combat stress, I've outlined a few ideas below:

• Focus on the positive - focusing on the negative can lead to constant worrying and additional stress.
• Exercise – exercise helps you get your mind off whatever is stressing you, making it a great stress reliever.
• Find ways to relax – enjoy nature in a quiet spot, work on a hobby you like, talk and laugh with trusted family members and friends, listen to your favorite music, or read a good book.
• Add a few “I want to’s” into your daily or weekly routine.  It’s ok to treat yourself every once in a while.
• Learn to say “no” - saying “yes” to all requests might make you feel that others are taking advantage of you, causing undue stress.
• Laugh out loud - laughter can relieve stress and lighten one's mood.
• Take a day or a half day and do something for yourself.
• Take a nap - naps may help reduce stress and increase alertness and productivity

Stress can come from many sources and can sneak up on us before we realize it.  So, be proactive and incorporate some stress-relieving activities into your daily routine. 

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Exercise & Eat Right To Reduce Menopausal Weight Gain

While many women can probably attest to the fact that they gain weight after menopause, there has been some scientific debate about whether the weight gain and changes in body composition that take place during this time of life are related strictly to menopause or are just another unwanted part of aging in general.

A new research study in Chinese perimenopausal women attempted to clarify this debate.  For this menopausal body composition study, researchers collected data from 438 perimenopausal women between the ages of 44-55 years who took part in a large bone health study.  Body composition information was collected at the beginning of the study and after 9, 18, and 30 months.  Changes in body fat and lean muscle mass were compared between women who remained premenopausal, those who transitioned through menopause and women who were already in menopause at the start of the study.  The study investigators reported that:

• A decrease in lean muscle mass and an increase in total fat mass and trunk fat mass were observed overall during the 30-month follow-up period.
• Age was negatively linked to central obesity (belly fat), such that belly fat increased as the women got older.
• When the information was adjusted for age, menopause was specifically shown to be linked to a decrease in lean muscle and an increase in percent body fat and trunk fat mass.

Overall, this new body composition study showed that though aging in general is related to weight gain, the transition to menopause itself is linked to an increase in body fat, particularly belly fat.  Like many other aspects of the menopausal transition, these changes in body fat distribution have been reported to be due to the loss of estrogen during the menopausal transition.  While hormone therapy has been reported in some studies to decrease obesity in postmenopausal women, hormone therapy comes with its own set of risks.  Developing healthy diet and lifestyle habits remains the best approach to preventing or reducing the impact of menopause on body weight gain and body composition.  Eating healthy foods in appropriate portions and getting plenty of exercise are core to preventing menopausal weight gain.  Starting during the premenopausal years and developing life-long healthy habits is the best approach to maintaining a healthy body weight throughout life.

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Lose Belly Fat - Support Normal Blood Vessel Health

Just a few days ago, I mentioned the fact that excess belly fat is dangerous to our health.  These research studies have reported that excess belly fat (also called abdominal obesity) has been linked to poor heart health, poor blood sugar health, and overall mortality.  Previous studies have implied that belly fat gain might be linked to poor heart health by inducing changes in blood vessel health and the ability of blood vessels to stretch normally.  However, this potential link between belly fat and blood vessel health was unclear.

In an attempt to start better understanding the potential interaction between belly fat and normal blood vessel health, heart health researchers examined changes in blood vessel health during a short-term belly fat study (free to download).  For this study, the investigators recruited 43 healthy volunteers with a normal body weight and assigned them to either (1) maintain their weight for 16 weeks or to (2) gain weight for 8 weeks and then lose weight during a second 8-week period.  Changes in the ability of arm blood vessels to stretch and relax were measured at the beginning of the study, after weight gain and at the end of the study.  The heart health researchers reported that:

• Volunteers assigned to gain weight gained about 9 lbs on average over 8 weeks with over 80% of the weight gained as fat.
• In study volunteers that were asked to maintain their body weight, blood vessel health remained normal and unchanged.
• Volunteers who gained weight and belly fat developed poorer blood vessel health with substantial loss of blood vessel stretchability.
• Weight loss after the short-term weight gain resulted in a return to normal blood vessel health.

This is a fascinating study indicating the importance of maintaining a normal body weight or losing excess belly fat  for the support of normal blood vessel health.  According to these current study results, even a modest belly fat gain like seen during vacations or around the holidays can negatively impact blood vessel health.  Fortunately, losing this excess belly fat helped support normal blood vessel health.  While this study shows the possible impact of belly fat on normal blood vessel health, it also raises some interesting questions that will likely be the focus of future research studies.  For example, what happens to normal blood vessel health during long-term (over several years) weight gain, which is typical in many of us?  Also, can losing weight after years of carrying around excess belly fat still help with the support of normal blood vessel health and if so, to what extent?  And, how does weight cycling effect normal blood vessel health.  I look forward to seeing the answers to these types of questions in the future.

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Reducing Belly Fat Might Reduce Risk of Dying!

There are lots of names for it (pot belly, belly fat, etc.), but no matter what we call it abdominal obesity is dangerous to our health.  Numerous research studies have reported that abdominal obesity, or excess belly fat, has been linked to poor heart health, poor blood sugar health, and chronic inflammation.  It has also been shown that a large waist size is linked to an increased risk of death regardless of one's body mass index (BMI).  However, the effect of a large waist size within different BMI categories remained less clear until a new obesity study published in the recent issue of Archives of Internal Medicine.

For their study, obesity researchers analyzed data from over 48,000 men and over 56,000 women who took part in the Cancer Prevention Study II Nutrition Cohort.  Associations between deaths from 1997 - 2006 and waist size were examined after adjusting for BMI and various other risk factors.  The obesity investigators reported that:

• Very large waist sizes (> 47 inches in men and > 43 inches in women) increased the risk of death by more than 2 times.
• In men, an increase of about 4 inches in waist size was linked to an increased risk of death for those with a normal BMI (16%), overweight BMI (18%), and an obese BMI (21%).
• In women, a similar increase in waist size was also linked to an increased risk of death in all three BMI categories; 25% increased risk in normal BMI, 15% in overweight BMI, and 13% in obese BMI.

This new obesity study emphasizes the importance of getting rid of belly fat and maintaining a healthy waist size, regardless of one's body mass index!  Research suggests that abdominal obesity is particularly dangerous because it is linked with the development of fat tissue around internal organs.  According to the National Institutes of Health, a waist size over 35 inches in women and over 40 inches in men are linked to poorer health.  This new study expands upon that information indicating that very large waist sizes are linked to an increased risk of death.

Of course, the most interesting part of this study is the fact that this increased risk of death with increased waist size was even seen in men and women with a normal body mass index.  Therefore, even if one has a healthy body weight for their height, an overly large waist can still negatively impact their health.  The exact reasons for this are currently unclear and will require further research.  This finding may also add fuel to the debate on whether body mass index or waist:hip ratio are better measures of overall health.  In either case, be sure to make waist size an important part of your weight loss or weight control strategies.

My easy diet plan and physical activity plan, using my delicious, hunger-satisfying milk protein or soy protein bars and shakes, may help dieters to lose weight and reduce belly fat.  Tune in to watch me on QVC September 12th from 1 AM - 2 AM EST!