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Eat healthy foods. Avoid junk foods and prefer eating fruits and green leafy vegetables every day. This will leave you feeling generally more energetic and happy. Replace unhealthy snacks like a chocolate bar containing lots of calories, boasted with a piece of fruit or perhaps some nuts but do make sure to treat yourself once in a while which is okay. Also avoid too many processed foods altogether..Prefer eating apples, watermelons, papaya, grapes etc. the fruits which contain ultimate source of water. These fruits act as an enriched source for growing immune system, skin clarity/glow, and enhances your eye-vision, as opposed to your ear-hearing.