Why BMI is important
The same body weight in two persons would be interpreted differently depending on how tall the person is, right? That is why a person is said to be underweight, normal weight, overweight, or obese based not on body weight but on the body mass index (BMI). The BMI is calculated from a person’s height and weight.
Here’s an easy way for you to get to a BMI calculator. In your browser’s window, type in simpleandpractical.com/bmi. This is a link I have created that will take you to a BMI calculator.
Interpretation of BMI (Kg/m²)
< 18.5 — Underweight
18.5 to 24.9 -– Normal or healthy weight
25 to 29.9 – Overweight
30 or more — Obese
How common is obesity?
Over one-third of adults in the US are not just overweight, they are obese.
Why is the treatment of obesity so important?
It is essential for both us and the patient to fully realize how important the problem of obesity is.
Obesity is the second-most important cause of preventable death. Smoking is the first.
A person who is obese is at greater risk of many other conditions:
– Diabetes mellitus type 2
– Hypertension
– Coronary artery disease
– Stroke
– Non-alcoholic fatty liver disease
– Osteoarthritis
– Various cancers, including breast, colon, endometrium, and kidney.
For complicated reasons, the majority of patients are unable to lose a significant amount of weight and keep it off in the long run with lifestyle changes only.
Note that we must treat obesity not just for cosmetic reasons but because medications to treat obesity also:
– Improve metabolic/ cardiovascular parameters, and
– Delay the onset of complications of obesity.
Related Pages
What body mass index (BMI) is and why it matters
Why it is important to treat obesity
What is the relationship between obesity and mental disorders?
Weight loss medications and treatments
Should we prescribe medications for weight loss?
An overview of medications for the treatment of obesity
A generic alternative to naltrexone/bupropion (Contrave®)?
Bupropion plus naltrexone (Contrave): Basic information
Metformin for weight gain or obesity unrelated to antipsychotic medications?
A simple primer on what GLP-1 agonists are
Semaglutide injection (Wegovy™) for weight loss in obesity and overweight
Semaglutide injection (Wegovy™): Side effects
Semaglutide injection (Wegovy™): Serious side effects, warnings, and contraindications
Semaglutide injection (Wegovy™): Basic information
Orlistat (Xenical®): Basic Information
Phentermine and topiramate extended-release (Qsymia®): Basic Information
What to do about psychotropic medications after bariatric surgery
Why and how to monitor and evaluate for suicide risk after bariatric surgery
Why, who, and how to monitor for increased alcohol use after bariatric surgery
References
Bersoux S, Byun TH, Chaliki SS, Poole KG. Pharmacotherapy for obesity: What you need to know. Cleve Clin J Med. 2017 Dec;84(12):951-958. PubMed PMID: 29244650.
Friedman GD. Body mass index and risk of death. Am J Epidemiol. 2014 Aug 1;180(3):233-4. doi: 10.1093/aje/kwu121. Epub 2014 Jun 3. PMID: 24893709.
Koch M, Jensen MK. Body mass index and risk of dementia. Curr Opin Lipidol. 2018 Feb;29(1):49-50. doi: 10.1097/MOL.0000000000000478. PMID: 29298273.
Lee PC, Dixon J. Pharmacotherapy for obesity. Aust Fam Physician. 2017;46(7):472-477. PubMed PMID: 28697290.
Woo J. Body mass index and mortality. Age Ageing. 2016 May;45(3):331-3. doi: 10.1093/ageing/afw042. Epub 2016 Mar 24. PMID: 27013502.
Yoo HJ. Body Mass Index and Mortality. J Obes Metab Syndr. 2017 Mar;26(1):3-9. doi: 10.7570/jomes.2017.26.1.3. Epub 2017 Mar 30. PMID: 31089487; PMCID: PMC6484934.
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SMD says
I appreciate you covering anti-obesity medications and how to use them, as well as including the fact that people don’t have to lose massive amounts of weight (only 5-10% of current weight) to gain health benefits. There is a big overlap between obesity, a disordered relationship with food and one’s body as well as with eating disorders, including BED, but BN and AN as well. Additionally, in our culture, while something like hypertension is viewed as something you have, obesity is often viewed as something you are, but wouldn’t be if you had more strength of character. Many of our overweight patients have both internalized the body shaming they have received, even from health professionals, including psychiatrists, and have tried multiple times to lose weight and maintain the weight loss. They are often ashamed of their bodies and may just be done with health professionals telling them to lose weight when they’ve already tried so hard for so long.
How do we address the important medical implications associated with being overweight and the benefits of moderate weight loss while respecting that even mentioning it may be painful to a patient? How can we ensure that we, as psychiatrists, take a thoughtful family and individual food and body relationship history and diet history as well as do a screen for eating disorders (SCOFF Questionnaire is one option) and disordered eating in the patients whose obesity we’d like to treat? Also, if a person has “lived in a larger body”, as it is often referred to now, for much of their lives, despite efforts, often including surgery, to lose weight, how do we know when the psychological cost of the continued effort involved in trying to lose weight is more damaging to quality of life and health than the health and possible mental benefits of continuing to work to lose weight and keep it off?
If we have a patient who dreams of losing substantial weight, despite being unable to lose or maintain loss in the past, how do we support the psychological health in the wish to be fitter and less at risk of multiple diseases, without inadvertently colluding with a belief they may have that being thin is the only way to be acceptable?
We have to be sure that we’re not just calculating and treating the BMI, but understanding and addressing if necessary, the beliefs a person has about self, food, exercise and worthiness to exist, maybe even before treating the obesity, and anticipate with them what it will be like if they don’t lose as much weight as they hope. Without this, weight loss efforts, including surgery will be less or even ineffective. A respected dietician colleague of mine frequently says, “The Hate-Weight never stays off.” That is, weight loss motivated by body loathing is less likely to be enduring.
Asking a patient if they’ve thought about losing weight is an important but very laden can of worms that includes much, much more than calculating a BMI and prescribing a medication.
Thank you for writing about this important issue of treating obesity. If there is a segment in the works that addresses how to help the patient non-judgmentally accept themselves as they are, while also trying gently, consistently and self-compassionately to create a lifestyle that promotes self-care, food and exercise modifications, and possibly including medication that can lead to greater health perhaps including weight loss, I would be very interested in reading it!