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A varied healthy diet eating small portions is the best way to go. If you fill yourself up with stodgy fat filled food you are liable to become a couch potato and have multiple naps during the day. this may isolate you very quickly and the fatter you get the more isolated and unhealthy you could become. Napping during the day destroys your sleep hygiene and you could rapidly sink into a depression and need sleeping pills and then a "waking up pill". It is very important to socialise and keep as active as possible.