Weight redistribution and metabolic changes

Many women notice weight gain or changes in body shape during and after breast cancer treatment, especially around the tummy. Several factors usually work together. When menopause happens, or oestrogen falls because of treatment, the body tends to store more fat around the abdomen rather than the hips and thighs. Muscle mass naturally declines, which lowers the number of calories the body burns at rest. Chemotherapy often causes tiredness and reduced activity, and steroids given to prevent sickness can increase appetite and raise blood sugar. Some hormone therapy medicines may be linked with weight gain in some women, and joint aches can make exercise harder. Emotional eating, disturbed sleep and changes in daily routine also play a part. These metabolic changes matter beyond appearance, because abdominal weight is associated with higher risk of diabetes, heart disease and, in some studies, poorer breast cancer outcomes. The encouraging news is that regular physical activity, especially combining aerobic exercise with strength training, and a balanced eating pattern can help manage weight, rebuild muscle, improve energy and support heart and bone health. Crash diets and extreme restrictions are not recommended, as they can cause muscle loss and tiredness. Small, sustainable changes usually work best, and a dietitian can help create a realistic plan.

It is common

Weight and shape changes are frequent after breast cancer treatment.

Muscle matters

Rebuilding muscle helps metabolism, strength and bone health.

Small changes add up

Sustainable habits are more effective than short-term diets.

Regular exercise is one of the most effective ways to manage weight and improve health after breast cancer.

Aerobic activity

Aim for regular brisk walking, cycling or dancing most days, building up gradually.

Strength training

Resistance exercises with bands, light weights or body weight rebuild muscle.

Protect your arm

If lymph nodes were removed, build arm exercises slowly and watch for swelling.

Make it enjoyable

Walking with friends, yoga classes or dancing at home help you stay consistent.

Start where you are

Even short sessions help; build up as energy returns.

During chemotherapy, radiation and the early months of hormone therapy, the main aim is to stay as strong and well nourished as possible, rather than to lose weight quickly.

Focus on strength, not dieting

Strict diets during treatment can cause muscle loss, tiredness and poor healing. Your team may advise against deliberate weight loss until treatment is complete.

Stay gently active

Short walks and light stretching on better days help maintain muscle and energy, and may ease tiredness and nausea.

Manage steroid hunger

If steroids increase appetite, keep healthy snacks such as fruit, roasted chana, curd or nuts ready, and avoid sugary foods that can raise blood sugar.

Eat enough protein

Protein supports healing and muscle. Include dal, eggs, curd, paneer, fish or chicken as appetite allows.

Watch for rapid changes

Tell your team about sudden weight gain, swelling, or unexpected weight loss, as these may need checking.

After treatment ends

Once treatment is complete and energy returns, a gradual plan for healthy weight can begin, ideally with help from a dietitian or exercise specialist.