According to research by the national authoritative scientific research institution, a brand of health foods currently on the market does not contain ingredients that improve human body functions and enhance individual immunity. However, the survey results show that many people who are physically weak are buying and taking the brand After a period of time, physical fitness has improved significantly. which is the most helpful to explain the above contradiction? ['The role of health food has a certain time lag.', 'Many healthy people also strengthen their constitution after taking health food.', 'Most people who buy this brand of health products have better economic conditions.', 'People taking health supplements also start to pay attention to health in other aspects of their lives.']