In order to conduct a valid experiment, the variables must be identified and managed. If time is a variable, it is always the control variable. The other variables are called response variables and, in an experiment, they are measured for certain values of the control variable. I believe some persons' risks are higher due to saccharin in diet cola, and olestra in diet foods. I have read that these products have greater side effects, such as memory lost, lupus, and higher deaths.
Anecdotal evidence is a form of inductive reasoning but it can lead to erroneous conclusions.
Be careful to separate scientific conclusion from opinion based inference. In order to make a risk assessment, the actual cause and effect must be ascertained. It is perfectly OK to disagree but you must support that disagreement with a basis for it. As science and scientific thought emerged, these languages formed a uniform way of communicating amongst those whose native languages varied considerably. The idea that the universe is not losing energy seems to contradict the idea that entropy is always increasing.