Please list the various phases in Intermittent Fasting ordered by when they occur after starting the fast, and provide a description of what happens in the body during each phase in about 150 words for each.
length_constraints:number_paragraphs detectable_format:number_highlighted_sections length_constraints:number_words keywords:frequency startend:quotation keywords:forbidden_words change_case:english_lowercase
at least
less than
relationships
health
Please reply in details, and include exactly 3 paragraphs. Separate the paragraphs with *** Make sure to highlight at least 2 sections in your answer with markdown, i.e. use *highlighted section* Keep your entire response at least 13 words or less. Mention the word "relationships" for less than 2 times Your answer need to be wrapped in double quotes The words health cannot be in the response All letters in your response must be lower case letters