If the 20th century was one of reductionism, the 21st century is all about system biology. Knowing the function of individual parts is important, but so is looking at the body holistically. Every piece affects the other in complex ways.
Think of the body as a factory. DNA, the architect, draws up daily instructions (RNA) to build protein. The body can only use what it’s supplied for this process. Give a factory bad supplies and it will make a bad product. You are what you eat, as the saying goes.
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