16 Hour Fasting

What is intermittent fasting/16 hour fasting and how do we do it?
Why specifically 16 hours of fasting?
Do I have to skip my breakfast in order to do a 16 hour fast?
If I have a gastric/acidity problem, can I fast?
Can I drink water during the16-hour fasting window?
What are the other ways to fast apart from 16 hour fasting?
Why do we feel weakness when we start fasting?
Can we have lemon water/lemon juice during the 16 hour fast?
Does fasting help high blood pressure?
Can I have the ABC (apple, beetroot, carrot) juice during the 16 hour fasting window?
Can we do dry fasting/ nirjala upwas?
What kind of physical activity can I do during the 16 hour fast?
I am facing a headache while fasting. What should I do?
Can we have tea or coffee during the 16 hour fast? What about herbal tea?
Can we consume fruit juices during the 16 hour fasting window? Are fruit juices good?
I feel hungry during the 16 hour fast. What should I do?
I feel hungry even after dinner. What should I do?
How long do we have to do the 16 hour fast till?
What is the best food to break the fast with?
What all can I have during the fast?
How do I take medicine if I am fasting?
Should I fast if I am diabetic?
Should athletes fast?
Does my fasting window have to be the same everyday?
Shouldn't breakfast be the heaviest meal of the day? Why should we do a 16 hour fast?
I am underweight. Should I also do a 16 hour fast everyday?
I workout and exercise. Should I still do a 16 hour fast everyday?
What type of fasting can we do on our own? How to do it? How often to do it?
I want to follow 9 days of fruit fasting. What fruits to consume and how often should I consume them?