LIFESTYLE NEWS - Losing several kilograms can feel like a major health achievement, but the number on the bathroom scale does not tell the whole story.
According to Dr Gerhard Vosloo, founder and head consulting practitioner at Dr GL Vosloo Medical Practice, managed by BioWell, rapid or substantial weight loss can affect bone health if it is not carefully managed.
The concern is that not all weight lost is necessarily body fat.
Depending on how weight loss is achieved, muscle mass and bone density may also be affected.
Why bone health matters during weight loss
Bone is living tissue that is constantly being broken down and rebuilt through a process known as remodelling.
This process allows the skeleton to adapt to the physical demands placed on it. However, when bone is lost faster than it can be rebuilt, bone density can decline and the skeleton can become weaker.
Lower bone density can increase the consequences of everyday accidents. A fall, awkward step or relatively minor knock may result in a fracture that could otherwise have been avoided.
For some people, this can lead to significant pain, restricted movement and time away from exercise or work. More serious fractures can also affect long-term mobility and independence.
Why rapid weight loss can affect bones
There are several factors that may contribute to bone loss during rapid weight reduction.
As body weight decreases, the skeleton carries less load and therefore receives less of the mechanical stimulus that helps maintain bone strength.
At the same time, aggressive calorie restriction can make it more difficult to obtain sufficient protein, calcium, vitamin D and other nutrients required for maintaining healthy bones.
Hormonal changes and loss of muscle mass can also influence bone remodelling, potentially shifting the balance towards bone breakdown rather than rebuilding.
The source notes that, in some cases, bone loss may persist even after some of the weight and body fat that was lost has been regained.
Four principles for healthier weight loss
Dr Vosloo says a more measured approach can help protect skeletal health while pursuing weight-loss goals.
1. Take a conservative approach
A conservative weight-loss programme avoids placing unnecessary demands on the body simply to achieve faster results.
That means not continually cutting calories or increasing exercise demands because the scale can be pushed lower.
The focus should instead be on sustainable progress that allows the body to recover while maintaining strength and normal daily function.
2. Aim for gradual weight loss
A controlled rate of weight loss gives the body time to adapt and allows changes in strength, physical capacity and nutritional status to be monitored.
It can also make it easier to identify potential problems early and adjust the approach where necessary.
3. Make medical guidance part of the process
Weight management involves more than calories and exercise. Nutrition, physical activity, recovery and changing health markers all need to be considered.
A doctor-led programme can provide an individual plan and regular follow-ups, with adjustments made according to the patient's response, side effects, clinical markers, progress and changing needs.
4. Look at the whole picture
Simply eating less or exercising more does not necessarily provide a complete weight-management strategy.
A holistic approach considers nutrition, muscle and bone health, physical activity, metabolic health and any treatment that may be required.
Regular monitoring can help ensure that weight is being lost in a controlled manner without unnecessarily compromising strength, physical function or overall health.
The goal should be healthier weight loss
Ultimately, successful weight loss should not be measured by kilograms alone.
The more important question is what is being lost - and what is being preserved?
A sustainable approach should aim to reduce excess body fat while protecting muscle mass, bone health, strength and physical function.
As Dr Vosloo puts it, losing 15kg while becoming physically weaker and compromising overall health should not be regarded as a successful outcome.
The goal of weight loss should be to leave the body healthier, stronger and better equipped for the long term - not simply lighter.
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