In seeking to understand such systems the scientist must unravel many interacting factors. The effect observed after a certain event may be modified, enhanced or diminished by other factors. For example, for a particular level of cigarette smoking the risk of lung cancer can be decreased by a regular intake of green leafy and yellow vegetables. The risk of cancer of the throat from cigarette smoking can be increased by regular intake of alcohol. Pseudo-science is rife.
Many people now use a scientific vocabulary, to inspire confidence in what they say or write.
But careful analysis shows their case to be phoney. For example, you might read that 'stomach enzymes do not work on vegetables and fish at the same time and therefore these foods should not be eaten together'. First you might note that most people at some time combine these foods, and that doctors and government health officials now recommend consumption of these foods to promote good health and a long life. You might still want to seek more information on the suggestion that combining the foods is not a good idea. The explanation offered is inaccurate.