FWIW, just did a quick calculation based on what I've had to eat, or plan to eat today, and I'm just shy of 1,400 cal. 3 meals in the I.F. window of 10:30a-6:30p. Hydration is at least 1 gal of water daily. Doesn't make sense when that weights 8.3453 lbs/gal. Black coffee or tea is allowed, but doesn't count for daily count. Lean protein, vegetables, a fruit, and a fat with each meal. Not specifying the quantity of each, but it's generous and not restrictive. No dairy, sugar, grains or alcohol. Multi-vitamin, glucosamine and apple cider vinegar tablets are supplements I chose to take, but not required on the plan.