You worded your question weirdly...
There are many ways to become and stay healthy.
You need to balance your diet and follow the Food Pyramid or My Plate. You can also develop a workout plan and make it part of your everyday life. You need to make sure you get enough of you're daily required nutrients and vitamins :)
If you want a more detailed answer, make add me as a friend, I can definitely help you! I took 7 years of Cooking and Foods and nutrients
Smoking or drug addiction for an expecting mother is more dangerous because not only are the chemicals affecting her but they are affecting her baby as well if addiction continues through to the birth of the child the baby can experience withdrawal symptoms and can be underdeveloped
False there is no window period if you get HIV it will be in your blood when they test it
Hope this helps