Nutrition is an important modifiable factor for patients with chronic obstructive pulmonary disease (COPD). Being overweight brings breathing difficulties and being malnourished leads to poorer outcomes. Maintaining a healthy weight and a nutritious diet is a central part of COPD management. This article equips general practice nurses (GPNs) and patients with the tools needed to assess and promote a healthy weight and diet while living with COPD. It explains the reasons for malnutrition and how these can be avoided. Helping people improve their diet as well as the role of oral nutritional supplements (ONS) are explored, and specific issues, such as vitamin D deficiency, are discussed.