What are "three MINUS three students" talking about?

At present, the situation of chronic diseases in China is grim. In the past eight years, the National Healthy Lifestyle Campaign has been able to mobilize 80% of counties and districts in China to advocate healthy lifestyles, and has made active efforts to improve national health awareness and health literacy and prevent and control chronic diseases. In the next decade, it is proposed to carry out the action of "three reductions and three health" and advocate "reducing salt, oil and sugar, healthy mouth, healthy weight and healthy bones". These are all important healthy lifestyle issues that people need to solve. He once again appealed that in the face of the urgent situation of prevention and control of chronic diseases, more attention should be paid to prevention and more departments should participate in the promotion of healthy lifestyles.