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_words keywords:frequency length_constraints:number_paragraphs startend:quotation keywords:forbidden_words change_case:english_lowercase detectable_format:number_highlighted_sections
at least
less than
relationships
health
Keep your entire response at least 13 words or less. Mention the word "relationships" for less than 2 times Please reply in details, and include exactly 3 paragraphs. Separate the paragraphs with *** 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 Make sure to highlight at least 2 sections in your answer with markdown, i.e. use *highlighted section*