Thank you for the opportunity to help you with your question!
Macro-molecules like lipids and carbohydrates are part of the 6 essentials nutrients you need in order to have a nourished body. If you intake too many lipids and carbohydrates however, it can cause a increase in cholesterol which can be dangerous
Not sure how to answer #2, please give me some more info on that one and i will do it.
As the human population increases there will be more viruses and more people to be infected causing the virus to spread faster.
Please let me know if you need any clarification. I'm always happy to answer your questions.