There is no such thing as what is the fastest and best thing for a man to eat to produce sperm. You can do this through diet, changing bad habits, medication and other methods. 1. Diet: Diversify your diet in order to achieve the purpose of nutritional balance, eat some nutty foods, as well as green leafy vegetables and fruits. 2. Change bad habits: quit smoking and drinking, exercise more, quit masturbation, sexual life should also have moderation, and avoid contact with unfavorable chemical environment, as well as electricity radiation and other stimuli, avoid high temperature stimulation of the perineum. 3. Medication: Commonly used medications include Wu Zi Diffractive Zong Pills, Sperm Capsules, Kirin Pills and so on. If you have sperm abnormalities, you need to go to the hospital in time for examination and treatment, and all medications need to be used under the guidance of a professional doctor to avoid abusing medications.