I attended a Hapkido seminar with Grandmaster Ji Han Jae, he was the fighter in Game of Death right before Kareem. After the Seminar I was invited out for dinner with Master Jae. He has a lot of rules about what and how you can eat for strength and health.
I'll include the list but one of the rules was always drink water at room temperature, and don't let the water touch the top of your molars as that releases a bit of adrenaline and Adrenaline needs to be saved for fighting.
Foods that inhibit the KI's full potential: Eat well. Do not eat pork because it restricts the heart circulation. Poultry reduces the oxygen intake of the lungs, and slows the body's natural healing process (web-footed birds like the duck are all right to eat; it is the open-clawed birds that are unhealthy.) Fish without scales (e.g. calamari, octopus, eel and shark) suppress the detoxification properties of the liver. Too much peppery, spicy food causes stomach ulcers, while overdoing salt destroys the kidney's filtering abilities. Do not drink alcohol as it kills brain cells. All these items are poisonous foods that harm the internal organs, thereby inhibiting the production of adrenaline hormones in the body.
Adrenaline is your physical KI and it is blocked by the harmful influence of these foods on your body. If even one of your major internal organs is ill, it affects the other organs and weakens them considerably.
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