You'll find you can use much less salt than the recipe calls for and get a saltier taste. Salt added in cooking often makes foods tougher and the taste is mostly lost. When added in very small amounts is can impart a salty flavor - but in larger amounts is can be very sour. Most health food stores carry Bragg's Liquid Aminos, a product made entirely from soy beans. It has a very salty soy sauce flavor, but has about the same amount of sodium as salt-reduced soy sauce, shoyu or tamari.
Caffeine is one of the world's most popular drugs.
Some research has shown it to be harmful to those who already have heart disease and many other health problems, but a large scale study published in 2001 indicated that moderate intake of caffeine, up to 2 cups of ordinary coffee per day, does not increase risk factors for heart disease. Persons who have had recent heart surgery or have irregular heartbeat should definitely avoid caffeine. Caffeine can shorten reaction time, keep one awake temporarily and give the feeling of increased energy. As with many drugs, the body can begin to build a tolerance to caffeine. This means that a person may need increasing amounts to get the same effects.