I was going to post only here But reading some of the posts in the other groups, I have had to comment, because saying it is ok for everyone to do is bollocks.😠 I have added one reference to disordered eating - which could be the biggest negative of all. Before you consider a dry fast — the checklist Most of what gets shared in fasting groups is about how to do it. This is the part that comes first and decides whether it goes well. 1. Screen yourself out honestly. Don't do this at all if you have: type 1 diabetes · any cardiac rhythm or conduction disorder · renal impairment of any cause · a malignancy · thyrotoxicosis · liver cirrhosis or chronic hepatitis · a history of disordered eating · are pregnant, or breastfeeding · are markedly underweight. Needs medical oversight, not a group challenge: type 2 diabetes · gout or kidney stones · gallstones · peptic ulcer · severe hypotension · coronary disease · over 70 or under 14. 2. Sort your medication before anything else. SGLT2 inhibitors, lithium, and the combination of an ACE inhibitor/ARB with a diuretic and an NSAID are the ones that turn this from risky into dangerous. With any glucose-lowering drug, a normal glucose reading is not reassuring — ketones are the measure. And answer the practical question in advance: how are you taking your tablets? 3. Get bloods while you still have time to act on them. U&Es (especially sodium), creatinine and eGFR, LFTs, FBC, glucose. Add urate if you're keto or carnivore, and phosphate and magnesium if you're planning anything multi-day. 4. Take a baseline you can measure against. Morning body mass on the same scales, after voiding, two or three days running. Sitting and standing blood pressure and pulse. Urine specific gravity if you can. Without a baseline, every number during the fast is meaningless. 5. Write your stop criteria down before you start. ≥2% body mass loss. A ≥30 bpm pulse rise on standing. Urine specific gravity above 1.020. Under 400 mL of urine a day. Flank pain, confusion, palpitations, dizziness on standing. Decide now, while you're thinking clearly — because reinterpreting these as detox is exactly what happens in the moment.