"Water" Formula info ....from Ro

Hi, All! Here's the cross-over info: eNutrition Reply: Fluid requirements depend on MANY factors including your personal medical history, amount & duration of exercise done, outside temperature, fever, stress or illness. When we as RD's calculate fluid needs for patients, generally healthy adults are calculated at 40 cc/Kg. For example a person who weighs 150 lbs or 68 Kg x 40 cc/Kg = 2727 cc fluid per day/240 cc in an 8-oz cup = 11.3 cups per day or 90 ounces per day. I think this is a more accurate way of determining fluid needs versus a blanket number of ounces for everyone based on how far out a person is post-operatively. 2nd Inquiry: Hi, Melania! Thanks for the water calculation info. I am going to do the number now and also talk with my Nutritionist next week. I feel much better since I've added another bottle of water and my body seems to be adjusting too. The one-size fits all thinking that I've been looking for doesn't consider all of the variables that you mentioned. Do vitamin and mineral deficiencies also become variables? I will be discussing my levels after Labs with my Nutritionist. I have a lot of confidence in the info that he has given me and am also glad to have your group involved on OH. Just in case you want an example of a deficiency problem... here's mine! "OH" (pun intended), You had to see that one coming! LOL Ro Comment/Formula: DH helped with the calculations on this one. Here's the math on # for oz, for a generally healthy adults. WLS patients have different needs than the general populations, so I'm checking with my Nutritionist at next week's appointment. I'll update on the reply to my 2nd inquiry about vitamin and mineral defiencies role in water intake, when the info is available. The Math... Taking Melania's example of an 150 # person...we reversed the equation...and know that she used 2.20588 as her convertion number, which she rounded to 2.206. It was easier to use the calculator's read-out than to "round" a few times so here's what we did: 150 lbs divided by 2.206 = 67.996 67.996 x 40 = 2719.85 2719.85 divided by 240 = 11.332 11.3 cups per day .... 11.3 x 8 oz = 90.661... approximately ...90 oz SOOOOOOOOOOO....it's .... weight (commando) divided by 2.206 using that number x 40 = ............. using that number divided by 240 =................. which gives you the cups per day.... for oz per day just multiply (x...LOL) by 8.....= ........... oz, if you were a generally healthy adult , but you're probably not if you've had WLS! Hope this helps with the calculations. I'm so MI (Math Illiterate; not spatial too!)...Ro

My head still hurts so there is no way i'm going to attempt this formula but will give it a go just as soon as it is better, this looks fascinating (if somewhat Greek). Thank you for bringing this over here...I'd have forgotten to go look for it otherwise. Molly

Hey, Skinny! Sure hope that you feel better soon! I can't imagine the pain. Here's your 136# water intake, if you were generally.... you know the drill. 10.28 cups or 82.20 oz Watergirl... formerly Big Woman

THANK YOU for sharing that info with us! I am always looking for ways to improve and this helps a lot. Unfortunaly, at the weight i am still at requires 116 oz of water...can you believe the difference between that and the 64 that is usually recommended! um that is just short of twice as much (that math i can do- the other that your dh did, way overmy head)! Have a great day!

Hi, Dawn! I guestimate all the time with math related problems. It's so pathetic. DH is so kind that he used to help my girlfriend...emergency phonecalls...so that she could easily help her daughter with Math homework. I will update on if my Nut wants me to increase to 100 oz or not. I don't want to flush all of the potassium supplement out of my system. No Potassium = Heart Attack? I just don't know enough! Ro

I was asked for an easier way to explain the water formula. Hope that this helps! Ro The RD is using Kg; rather than lbs so that has to be converted first before the formula can be used. The number 2.206 is the correct number to use to change Kg into the same amount of lbs that you weigh. You have to divide your weigh by the number 2.206, which gives your weight in Kg. You have to multiple your Kg weight x 40 cc, which gives the amount of water needed for your weight in the cc amount. The cc amount has to be converted back into ounces. To change cc into ounces, you have to divide that rather high "cc fluid per day" number by 240 cc. The amount on the calculator is in "cups" per day; not ounces. When you multipe the "cups" per day amount by 8, you get the number of ounces to drink per day... if you were a generally healthy person...without WLS.