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.
keywords:forbidden_words detectable_format:multiple_sections length_constraints:nth_paragraph_first_word keywords:existence change_case:capital_word_frequency keywords:letter_frequency detectable_content:number_placeholders
falling
Section
falling
heart
less than
less than
e
Do not include the keywords: falling Make sure to include at least 3 sections marking the beginning of each section with 'Section X' Write exactly 2 paragraphs each separated with two new lines answering this instruction. The first paragraph must start with "falling" The response must include the keywords heart Respond with less than 4 words be in all capital letters The letter e should show up less than 5 times make sure it contains at least 1 placeholders represented by square brackets, such as [name]