Dear patient. Greetings from health care magic!!! I am Dr Thakker and shall be answering your question. I can understand your state of mind when you feel that your penis size is small and shrinking. However till date there are no food items that help to increase the size of penis. It is a gift of nature and not much can be done about its size. Masturbation does not cause shrinking of the testis or the penis. You seem to have read a myth somewhere which makes you belive so. I would want to reassure you that masturbation does not lead to shrinking of penis or testis. There is no fixed number of times that you should masturbate. It is a reflex way of expressing oneself. As a remedy I would suggest that you could visit the gym and have a high carbohydrate diet to gain weight. This will make you look full in the right areas. Also believe in yourself, because everyone is made different and has his own strengths. I hope this helps you out. If you have any more questions, please do not hesitate to write back to me. Yours sincerely, Dr Thakker.