Weight Loss: A General Guide
The health implications of excess weight, the evidence behind them, and an honest overview of the options available, from lifestyle changes through to medication.
This guide is aimed at anyone thinking about their weight and their health, whether or not you are already a BGM Medical patient. It is written to be honest and evidence based, without judgement. Carrying excess weight is common, it is not a moral failing, and there is a lot that can be done about it.
Why weight matters
Body weight, and particularly excess fat carried around the abdomen, has a direct and well-documented effect on long-term health. This is not about appearance. It is about the measurable impact of excess weight on how your heart, blood vessels, joints, liver, and hormones function.
How common is this in the UK?
According to the Health Survey for England, around 64% of adults in England are overweight or living with obesity, and around 26% are living with obesity specifically. This makes excess weight one of the most common, and most significant, modifiable risk factors for ill health in the country.
Source: NHS Digital / Health Survey for England, Statistics on Obesity, Physical Activity and Diet.
Health risks & the evidence
Excess weight is linked to a wide range of conditions. Some of the best-evidenced examples are below.
Cardiovascular disease
Excess weight raises blood pressure, LDL cholesterol, and triglycerides, while lowering protective HDL cholesterol. Obesity roughly doubles the lifetime risk of coronary heart disease and is a major independent risk factor for heart failure and atrial fibrillation.
Type 2 diabetes
Around 90% of people with type 2 diabetes are overweight or living with obesity. Excess fat, particularly around the abdomen, drives insulin resistance. Every unit increase in BMI meaningfully increases the risk of developing type 2 diabetes.
Sleep apnoea
Fat deposits around the neck and upper airway are strongly linked to obstructive sleep apnoea. Weight loss of even 10% can reduce the severity of sleep apnoea substantially, and significant weight loss can resolve it entirely in some people.
Joint & mobility problems
Every extra kilogram of body weight adds several kilograms of load through the knees when walking. Obesity is one of the strongest modifiable risk factors for osteoarthritis of the knee and hip, and for chronic lower back pain.
Fatty liver disease
Non-alcoholic fatty liver disease (NAFLD) affects an estimated 20 to 30% of UK adults and is closely linked to excess weight. Left unchecked it can progress to inflammation, scarring (fibrosis), and in a minority of people, cirrhosis.
Certain cancers
Obesity is linked to at least 13 types of cancer, including bowel, breast (post-menopausal), womb, kidney, and oesophageal cancer. Cancer Research UK estimates that excess weight is the second biggest preventable cause of cancer in the UK after smoking.
Sources: Cancer Research UK; NICE guidance CG189 (obesity: identification, assessment and management); British Heart Foundation; NHS.uk.
The benefits of losing weight
The encouraging side of this evidence is that even modest, sustained weight loss produces measurable health benefits, often well before reaching a "normal" BMI.
As a general rule of thumb, losing around 5 to 10% of body weight is associated with:
- Meaningful reductions in blood pressure
- Improved cholesterol and triglyceride levels
- Better blood sugar control, and reduced risk of developing type 2 diabetes
- Reduced severity of sleep apnoea
- Less joint pain and improved mobility
- Improvement in fatty liver disease markers
A well-known example: the DiRECT trial
The DiRECT trial (Lancet, 2018), run partly through UK primary care, found that a structured weight management programme achieved remission of type 2 diabetes in 46% of participants at 1 year, and 36% remained in remission at 2 years, without medication for their diabetes. This shows just how powerful sustained weight loss can be, with or without medication as part of the picture.
Lifestyle & non-drug options
For most people, lifestyle change is the starting point, whether or not medication ends up being part of the plan. Every programme we run begins here.
Diet & nutrition
A sustained calorie deficit is the foundation of weight loss, whatever approach you take to achieve it. There is no single "best" diet. Approaches that are structured, realistic, and something you can maintain long term consistently outperform short, extreme diets.
Physical activity
Exercise alone produces relatively modest weight loss, but it is one of the best predictors of keeping weight off long term, and it independently reduces cardiovascular and diabetes risk regardless of weight change. UK guidance recommends at least 150 minutes of moderate activity per week.
Sleep
Poor sleep disrupts the hormones that regulate appetite (ghrelin and leptin), increasing hunger and cravings for high-calorie food. Consistently short sleep (under 6 hours) is associated with higher rates of obesity.
Behavioural & psychological support
Structured behavioural programmes, and for some people CBT, help address the habits, emotional eating patterns, and thinking styles that maintain excess weight. These approaches have good evidence and work well alongside other strategies.
Peer & professional support
Regular review, whether with a clinician, dietitian, or structured group programme, is consistently associated with better long-term outcomes than going it alone. Accountability and check-ins make a genuine difference.
Reducing alcohol
Alcohol is calorie dense (7 kcal per gram) and lowers inhibition around food choices. Cutting back is one of the more straightforward changes with a meaningful impact on overall calorie intake.
We cover these approaches in much more detail, including achievable goals and where the strongest evidence lies, in a dedicated guide.
Read the full non-pharmacological weight management guideMedication options
For some people, lifestyle changes alone are not enough to achieve or maintain the weight loss they need, particularly where there is a strong biological drive to regain weight. This is where medication can help, not as a replacement for lifestyle change, but alongside it.
GLP-1 receptor agonists (Semaglutide, Tirzepatide)
Weekly injections that reduce appetite and slow digestion by mimicking gut hormones. In clinical trials they have produced average weight loss of 15 to 21% of body weight, results previously only achievable with bariatric surgery for most people.
We cover these medications, including specific drug names, prices, side effects, and how to take them, in detail in our dedicated guide.
Read the full weight loss medications guideGeneral advice
Be wary of quick fixes
Very low calorie or highly restrictive diets can produce fast initial results, but they are hard to sustain and weight is often regained. Slower, sustainable change tends to last.
Focus on habits, not just the number on the scale
Sleep, movement, and consistent eating patterns all matter, and improve health independently of weight itself.
Weight fluctuates day to day
Hydration, hormones, and food intake all cause normal daily fluctuations of a kilogram or more. Look at the trend over weeks, not individual days.
Consider what is driving your eating
Stress, poor sleep, boredom, and emotional eating are all common and addressable. A good assessment looks at these factors, not just calories.
Get support
People who check in regularly with a clinician, coach, or structured programme consistently do better long term than those going it alone.
Getting support from us
Whatever stage you are at, we offer honest, judgement-free support. This may involve lifestyle and nutrition advice alone, or medication where it is appropriate for you. If you would like to talk it through, please get in touch.