Bariatric Surgery

Overview

Bariatric surgery is an operation that helps some people with severe obesity lose weight by changing the size of the stomach, the path food takes through the gut, or both. It is not cosmetic surgery and not a quick fix. It works best as part of a long-term programme with diet, activity and medical follow-up.

Bariatric surgery is becoming more common worldwide, but it is still only offered to selected people who meet specialist criteria.

Most people who have it are adults with severe obesity and conditions such as type 2 diabetes, sleep apnoea or high blood pressure. It can also be considered for some teenagers in specialist centres. Older adults are assessed case by case.

Symptoms

Common symptoms

• There are no specific symptoms that mean you need bariatric surgery.
• Some people ask about it because of shortness of breath, joint pain, tiredness, poor sleep, or difficulty with everyday activities.
• Others ask because weight-related health problems such as type 2 diabetes or high blood pressure are hard to control.

Symptoms in children

• In teenagers, bariatric surgery is rare and only considered in specialist centres for severe obesity with serious health problems.
• A team will assess growth, puberty, mental health, diet and family support.
• It is not a first-line treatment for childhood obesity.

Symptoms in older adults

• Older adults can be considered, but the team will look at frailty, other medical conditions and medicines.
• Benefits and risks are weighed carefully.
• Healthy eating and follow-up are still essential.

Causes

Main causes

• Obesity is complex. Genes, hormones, sleep, stress, mental health, medicines, food access and surroundings all play a part.
• Bariatric surgery is considered when excess weight is affecting health and other approaches have not been enough.
• It is not a sign of weak willpower.

Risk factors

• Severe obesity, especially with type 2 diabetes, sleep apnoea, high blood pressure, fatty liver or joint problems.
• A family history of severe obesity.
• Weight cycling (losing and regaining weight) and long-term stress around food.
• Some medicines and health conditions that make weight loss harder.

When to see a doctor

See a doctor urgently if:

• After bariatric surgery, get same-day advice for a wound infection, persistent fever, vomiting that stops you keeping fluids down, or worsening belly pain.
• If you cannot keep fluids down or feel dizzy, seek urgent care.
• Call emergency services immediately for chest pain, severe breathlessness, fainting, or severe belly pain.

Book a routine appointment if:

• If you have severe obesity and want to discuss weight and health, talk to your GP or local health service.
• If you have weight-related conditions such as type 2 diabetes, sleep apnoea or high blood pressure, ask about support.
• If you have had surgery and have questions about diet, supplements or follow-up, contact your specialist team.

Diagnosis

Bariatric surgery is not diagnosed like an illness. Instead, a specialist team assesses whether it is safe and likely to help you. They look at your weight and health, your eating and activity, your mental health, and your past treatments.

Tests that may be done

• Weight, height and body mass index (BMI), a measure based on height and weight.
• Blood tests to check blood sugar, cholesterol, liver, kidney, vitamins and minerals.
• Blood pressure and heart tests if needed.
• Sleep studies if sleep apnoea is suspected.
• Scans such as an ultrasound of the liver, or an endoscopy (a camera test of the stomach) in some cases.
• A review with a dietitian and a psychological assessment.
• A review of your medicines and health conditions.

What to expect at your appointment

The assessment can take several weeks or months and may involve several appointments. You will have time to ask questions. Not everyone who is assessed will be offered surgery; the team will explain why and discuss alternatives.

Treatment

Bariatric surgery is one part of a specialist weight-management programme. It is combined with long-term changes to eating and activity, medical care and follow-up. The aim is to improve health, not just weight.

Self-care at home

• Attend all appointments before and after surgery.
• Follow your dietitian's eating plan and chew food well.
• Take vitamin and mineral supplements exactly as advised by your team.
• Sip fluids regularly and avoid sugary drinks.
• Move your body regularly, starting gently and building up.
• Do not smoke, and limit alcohol.
• Tell your team about new symptoms or problems.

Medical treatments

Specialist teams usually offer a structured programme. This can include healthy eating and activity support, behavioural therapy, treatment for weight-related conditions, and weight-management medicines prescribed by a qualified healthcare professional for some people. Bariatric surgery may be offered when other options are not enough. The team will explain the benefits and risks of each option.

When is surgery considered?

Surgery may be considered when you have severe obesity and weight-related health problems, or very severe obesity, and other approaches have not worked. Rules vary by country and health service. The specialist team will check whether surgery is safe and suitable for you.

Living with this condition

After surgery, you will eat smaller amounts and need to plan meals and fluids. You will have regular follow-up. Most people need time to adjust, and support helps.

Lifestyle tips

• Eat regular small meals and put protein foods first.
• Drink fluids between meals rather than with meals, as advised.
• Avoid sugary and fizzy drinks.
• Build up gentle activity such as walking, and aim for regular movement.
• Keep all follow-up appointments and blood tests.
• Get enough sleep and manage stress.

Diet and exercise

A dietitian will give you a personal eating plan. After surgery, food portions are much smaller. You may need to eat slowly, chew well and stop when full. Physical activity helps keep muscle and supports weight loss. Start gently and ask your team what is safe for you.

Mental health and emotional wellbeing

Food and eating can be tied to emotions, social life and culture. Some people feel anxious, low or grief-like after big eating changes. This is common. Talk to your team if you feel overwhelmed. If you have thoughts of harming yourself, call your local emergency number or a local crisis line right away.

Prevention

Some cases of severe obesity can be prevented or improved with early healthy eating, activity and support, but obesity is complex and not a personal failure. Bariatric surgery is a treatment for people who need it, not something to blame yourself for.

Vaccines

Your care team may review your vaccinations before surgery. Vaccines do not prevent obesity or the need for bariatric surgery.

Screening programmes

Routine health checks can find weight-related problems early. These may include weight and BMI, blood pressure, blood sugar and cholesterol checks. If you are worried about your weight, ask your healthcare provider about a check-up.

Complications

If left untreated

• Type 2 diabetes and high blood pressure.
• Heart disease and stroke.
• Sleep apnoea, which can make sleep poor and strain the heart.
• Fatty liver disease and joint problems.
• Fertility problems and mental health difficulties such as depression or anxiety.
• Reduced quality of life and difficulty with daily activities.

Long-term outlook

Many people lose significant weight after bariatric surgery and see improvements in diabetes, blood pressure, sleep and joint pain. Results vary, and surgery has risks. Long-term success is best with follow-up, healthy eating, activity and support. Your team can help you make an informed choice.

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