So is moderate drinking good for us? There are two ways we could answer this question. Firstly, we could run a randomised controlled trial, giving people a bit of booze every day for a long time, and see if they get healthier. Alternately, we can try and control for all of the external factors that are influencing the relationship between health and alcohol, and see whether moderate drinkers are still healthier.
Ngakho ingabe ukuphuza ngokulinganisela kusilungele? Kunezindlela ezimbili esingaphendula ngawo lombuzo. Okokuqala, singenza ucwaningo olulawulwayo olwenziwa ngendlela engahleliwe, sinikeze abantu utshwala nsuku zonke isikhathi eside, bese sibona ukuthi baba nempilo yini. Enye indlela, singazama ukulawula ezinye izinto zangaphandle ezinomthelela ebuhlotsheni phakathi kwempilo notshwala, bese sibona ukuthi ingabe abantu abaphuza ngokulinganisela basenempilo yini.