Obesity is a complex issue with many causes. It's caused when extra calories are stored in the body as fat. If you consume high amounts of energy, particularly found in high fat and high sugar foods, and do not use all of the energy through physical activity, much of the extra energy will be stored in the body as fat.
Day-to-day problems related to obesity include:
breathlessness.
increased sweating.
snoring.
difficulty doing physical activity.
often feeling very tired.
joint and back pain.
low confidence and self-esteem.
feeling isolated.