BMI stands for Body Mass Index. It's a calculation that uses your height and weight to estimate whether your weight is within a healthy range for your body.
Body Mass Index (BMI) is a tool that uses your height and weight to estimate whether your weight falls within a healthy range. It doesn't directly measure body fat, but it helps give a quick picture of whether you might be underweight, at a healthy weight, or living with overweight or obesity. Healthcare professionals often use BMI as an initial screening measure, not a diagnosis. It can point to potential risks linked to weight, such as type 2 diabetes or heart disease, and help determine whether someone could benefit from prescription treatments. However, BMI is just one piece of the puzzle. It doesn't account for muscle mass, bone density, or how fat is distributed throughout your body, all factors that can affect your health independently of BMI. It also doesn't reflect age, biological sex, or ethnicity, even though these play an important role in body composition and overall risk. Still, research shows that BMI remains a useful starting point when combined with other measures, like waist circumference or metabolic health indicators. That's why at DoktorABC, we use BMI as one of several factors to help prescribers understand your overall picture before recommending any treatment.
BMI is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). BMI = weight (kg) ÷ [height (m)]². If you're more familiar with imperial units: BMI = [weight (lb) ÷ height² (in²)] × 703. BMI results are generally grouped into the following categories for adults aged 20 and over:
After calculating your BMI, you'll see which range your result falls into. Underweight (<18.5): May increase the risk of malnutrition, weak immunity, or osteoporosis. Healthy weight (18.5–24.9): Typically associated with the lowest overall risk of chronic health conditions. Overweight (25–29.9): May raise the risk of high blood pressure, insulin resistance, and heart disease. Class 1 Obesity (30–34.9): Linked with higher chances of type 2 diabetes, high blood pressure, and sleep apnea. Class 2 Obesity (35–39.9): Often associated with greater risk for heart disease, mobility issues, and liver complications. Class 3 Obesity (40+): Carries the highest risk for chronic conditions such as diabetes, cardiovascular disease, and certain cancers.
BMI has its limitations. It doesn't show how your body weight is made up or where fat is stored. Muscle vs. fat: BMI doesn't distinguish between lean muscle and body fat. Fat distribution: Visceral fat can increase health risks more than fat in other areas. Metabolic health: BMI doesn't measure blood sugar, cholesterol, blood pressure, or inflammation. Fitness level: You can have a higher BMI and still be metabolically healthy. Age, sex, and genetics: These affect how weight impacts health but aren't reflected in BMI. Ethnicity: BMI thresholds may not apply equally across ethnic groups. Lifestyle factors: Sleep, diet, stress, and activity levels all influence health and aren't reflected in BMI.
Think of your BMI result as a starting point, not a final answer. It gives context, not a diagnosis. If your BMI falls within the healthy range, it's still worth monitoring blood pressure, energy levels, and nutrition. If your BMI is outside the healthy range, it's a cue to look closer — not a diagnosis. At DoktorABC, licensed prescribers review your full health profile — BMI, lifestyle, medical history, and goals — to recommend the right treatment or support plan. No matter your number, you deserve advice that fits your body and your life.
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Weight management with a UK-registered prescriber
Preliminary online consultation with a UK-registered prescriber. Treatment only if appropriate. Delivered to your door within 2–3 business days from dispatch.
Weight management with a UK-registered prescriber
Preliminary online consultation with a UK-registered prescriber. Treatment only if appropriate. Delivered to your door within 2–3 business days from dispatch.
Reviewed by a UK-registered prescriber
Every treatment decision is made by a prescriber.
Discreet from start to finish
From consultation to delivery, your privacy is protected at every step.
Regulated medication
All treatments are MHRA-regulated and dispensed by GPhC-registered pharmacies.
No upfront payment
You are only charged once a UK-registered prescriber has reviewed and approved your prescription.
Reviewed by a UK-registered prescriber
Every treatment decision is made by a prescriber.
Discreet from start to finish
From consultation to delivery, your privacy is protected at every step.
Regulated medication
All treatments are MHRA-regulated and dispensed by GPhC-registered pharmacies.
No upfront payment
You are only charged once a UK-registered prescriber has reviewed and approved your prescription.
Repeat or continue your treatment
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Your progress is saved.Reactivate your plan to continue your weight loss journey seamlessly.
Injectable and tablet options, both assessed and prescribed by a UK-registered prescriber.
Weight loss
Injection plan
Takenweekly
One injection a week, as instructed by your prescriber.
Tablet plan
Taken daily
One tablet a day.
No injections required.
3 steps. 100% online
Lose weight with a plan made just for you.
1
Complete the preliminary online questionnaire
Answer the questions about your health.
2
A UK-registered prescriber reviews your case
A prescription is issued only if appropriate.
3
Delivered to your door
Delivered in discreet packaging within 2–3 business days.
Weight management options
Injectable and tablet options, both assessed and prescribed by a UK-registered prescriber.
Weight loss
Injection plan
Takenweekly
One injection a week, as instructed by your prescriber.
Tablet plan
Taken daily
One tablet a day.
No injections required.
Treatment may be an option from BMI 30, or 27 with a related condition. A prescriber decides.
BMI Calculator
BMI stands for Body Mass Index. It's a calculation that uses your height and weight to estimate whether your weight is within a healthy range for your body.
Body Mass Index (BMI) is a tool that uses your height and weight to estimate whether your weight falls within a healthy range. It doesn't directly measure body fat, but it helps give a quick picture of whether you might be underweight, at a healthy weight, or living with overweight or obesity. Healthcare professionals often use BMI as an initial screening measure, not a diagnosis. It can point to potential risks linked to weight, such as type 2 diabetes or heart disease, and help determine whether someone could benefit from prescription treatments. However, BMI is just one piece of the puzzle. It doesn't account for muscle mass, bone density, or how fat is distributed throughout your body, all factors that can affect your health independently of BMI. It also doesn't reflect age, biological sex, or ethnicity, even though these play an important role in body composition and overall risk. Still, research shows that BMI remains a useful starting point when combined with other measures, like waist circumference or metabolic health indicators. That's why at DoktorABC, we use BMI as one of several factors to help prescribers understand your overall picture before recommending any treatment.
BMI is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). BMI = weight (kg) ÷ [height (m)]². If you're more familiar with imperial units: BMI = [weight (lb) ÷ height² (in²)] × 703. BMI results are generally grouped into the following categories for adults aged 20 and over:
After calculating your BMI, you'll see which range your result falls into. Underweight (<18.5): May increase the risk of malnutrition, weak immunity, or osteoporosis. Healthy weight (18.5–24.9): Typically associated with the lowest overall risk of chronic health conditions. Overweight (25–29.9): May raise the risk of high blood pressure, insulin resistance, and heart disease. Class 1 Obesity (30–34.9): Linked with higher chances of type 2 diabetes, high blood pressure, and sleep apnea. Class 2 Obesity (35–39.9): Often associated with greater risk for heart disease, mobility issues, and liver complications. Class 3 Obesity (40+): Carries the highest risk for chronic conditions such as diabetes, cardiovascular disease, and certain cancers.
BMI has its limitations. It doesn't show how your body weight is made up or where fat is stored. Muscle vs. fat: BMI doesn't distinguish between lean muscle and body fat. Fat distribution: Visceral fat can increase health risks more than fat in other areas. Metabolic health: BMI doesn't measure blood sugar, cholesterol, blood pressure, or inflammation. Fitness level: You can have a higher BMI and still be metabolically healthy. Age, sex, and genetics: These affect how weight impacts health but aren't reflected in BMI. Ethnicity: BMI thresholds may not apply equally across ethnic groups. Lifestyle factors: Sleep, diet, stress, and activity levels all influence health and aren't reflected in BMI.
Think of your BMI result as a starting point, not a final answer. It gives context, not a diagnosis. If your BMI falls within the healthy range, it's still worth monitoring blood pressure, energy levels, and nutrition. If your BMI is outside the healthy range, it's a cue to look closer — not a diagnosis. At DoktorABC, licensed prescribers review your full health profile — BMI, lifestyle, medical history, and goals — to recommend the right treatment or support plan. No matter your number, you deserve advice that fits your body and your life.
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3 steps. 100% online
Lose weight with a plan made just for you.
1
Complete the preliminary online questionnaire
Answer the questions about your health.
2
A UK-registered prescriber reviews your case
A prescription is issued only if appropriate.
3
Delivered to your door
Delivered in discreet packaging within 2–3 business days.
Our Medical Advisory Board
Your Privacy. Our Priority.
Your personal and medical information is fully encrypted, completely confidential, and never shared with third parties.
Our platform is fully GDPR-compliant, because when it comes to your health, privacy is not optional.
Your Privacy. Our Priority.
Our platform is fully GDPR-compliant, because when it comes to your health, privacy is not optional.
Overweight and obesity are common health concerns in the UK and are associated with an increased risk of conditions such as type 2 diabetes, cardiovascular disease, certain cancers and joint problems. For many adults, gradual and sustainable weight loss can be achieved through lifestyle changes, including nutrition, physical activity, sleep and behavioural support.
In some cases, medical treatment may be considered as part of a structured, clinician-led approach, particularly when excess weight is affecting health or increasing future health risks.
Important information: DoktorABC UK is a digital health platform that connects patients with independent, UK-registered healthcare professionals. DoktorABC UK does not itself provide medical care, issue prescriptions or dispense medicines. All clinical decisions are made by the UK-registered prescriber following an individual medical assessment.
Available treatment approaches
GLP-1 injectable therapy
Fat-blocker tablet therapy
Foundations of weight management
How the assessment process works
Complete a short, secure medical questionnaire.
Select a treatment category for assessment.
An independent UK-registered prescriber reviews your information and determines whether medical treatment may be appropriate.
Next steps are arranged following clinical approval.
Understanding excess weight and treatment options
Overweight refers to body weight that exceeds what is generally considered healthy for a person's height. Excess weight is associated with an increased risk of several long-term health conditions, including type 2 diabetes, cardiovascular disease, stroke, certain cancers and joint problems.
Overweight can be influenced by multiple factors, including dietary habits, physical inactivity, genetics, sleep patterns, stress, certain medicines and underlying medical conditions
How overweight is defined
A commonly used measure is the body mass index (BMI), which relates body weight to height.
BMI category
BMI value
Overweight
BMI ≥ 25
Obesity
BMI ≥ 30
Note:
BMI is a screening tool and does not distinguish between fat mass and muscle mass. A healthcare professional can help interpret BMI results in the context of overall health.
BMI is calculated as body weight in kilograms divided by height in metres squared.
Example: A person who weighs 60 kg and is 1.70 m tall has a BMI of 20.8, which falls within the generally accepted healthy range of 18.5 - 24.9.
Good to know. BMI does not distinguish between fat mass and muscle mass. People with higher muscle mass may have a higher BMI without excess body fat.
When should being overweight be addressed?
Weight management is often recommended when excess weight is affecting health or increasing the risk of future complications, such as high blood pressure or type 2 diabetes.
Support may also be appropriate when excess weight affects mobility, mental wellbeing or quality of life. Any decision about treatment should take individual factors into account, including age, overall health and lifestyle, and should always be discussed with a qualified healthcare professional.
Important. Some medicines, including certain corticosteroids and antidepressants, can contribute to weight gain. Any concerns about medication should be discussed with a UK-registered prescriber rather than stopping treatment independently.
Which healthcare professionals can support weight management?
Depending on individual needs, different healthcare professionals may be involved:
General practitioner (GP) or primary care clinician
Often the first point of contact for assessment, referral,and ongoing support.
Registered dietitian
Provides structured dietary guidance and a personalised nutrition plans.
Endocrinologist or metabolic specialist
May be involved when hormonal or metabolic conditions contribute to weight gain.
Specialist obesity or bariatric service
May be considered for severe obesity or when surgical options are being explored.
Psychologist or psychiatrist
Can support people where emotional, behavioural or psychological factors influence eating patterns or weight.
How are excess weight and obesity managed?
Management usually involves a combination of approaches, tailored to the individual:
Lifestyle-based interventions. Dietary changes, physical activity, improved sleep and structured lifestyle changes form the foundation of weight management
Medical treatment. For some adults, prescription medicines may be considered by a clinician as part of a structured treatment plan. These are only prescribed following a medical assessment and are intended to support lifestyle changes, not replace them.
Surgical interventions. For severe obesity, surgical options may be considered after a comprehensive assessment.
Medicines that may be considered in weight management
Where clinically appropriate, prescribers may consider medicines that act on appetite regulation or nutrient absorption.Suitability depends on individual health profile, existing conditions and current prescribing guidance.
Fat-blocker medicines
Medicines containing orlistat work by reducing the absorption of dietary fat in the digestive system. Clinical studies show modest average weight loss when combined with a reduced-fat, calorie-controlled diet.
GLP-1 receptor agonists
These medicines mimic a naturally occurring gut hormone that helps regulate appetite. They may support weight loss by slowing digestion and reducing hunger signals in the brain. Examples include medicines containing semaglutide, liraglutide or tirzepatide.
In large clinical studies, adults with overweight or obesity who took semaglutide alongside lifestyle changes lost an average of approximately 15% over 68 weeks, compared to those who received a placebo. Individual outcomes vary and cannot be guaranteed.
Important. All medicines can cause side effects and should only be used under medical supervision. They work best alongside changes to diet and lifestyle. Research into long-term side effects of these medicines, including what happens to an individual when they are stopped is still ongoing.
How DoktorABC UK supports access to care
DoktorABC UK is a digital health platform that connects patients with independent, UK-registered healthcare professionals. Patients can access a clinical assessment through a secure online process.
A UK-registered prescriber reviews the information that you provide and determines whether treatment may be appropriate for you. If treatment is considered suitable, a prescription is issued by the UK-registered prescriber in accordance with UK regulations.
DoktorABC UK does not itself provide medical care, issue prescriptions or dispense medicines. All clinical decisions are made by the independent prescribing healthcare professional following an individual assessment.
Summary
Excess weight and obesity have complex causes and often require a structured, long-term approach. While lifestyle changes remain central to weight management, some people may benefit from additional support under clinical supervision. A healthcare professional can identify the most appropriate options based on individual circumstances
Medical disclaimer
This information is provided for educational purposes only and does not replace personalised medical advice. Diagnosis and treatment decisions must always be made by a qualified healthcare professional following an individual assessment.
The medical content on this page has been reviewed by qualified healthcare professionals. Information is drawn from reliable, trustworthy and verified sources, studies, research and expert opinion. Medical content is reviewed regularly to ensure maximum accuracy and reliability.
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