One thing patients often tell me in the early weeks following bariatric surgery is, “I didn’t realise drinking enough would take this much thought.”
It is understandable. Most people preparing for weight loss surgery are thinking about how much they will be able to eat, what foods they can have and how quickly they might lose weight. Drinking water does not tend to be high on the list of concerns.
Yet hydration is something we pay close attention to during recovery.
Having cared for bariatric patients for many years, I have seen that the difficulty is rarely that someone does not understand the importance of drinking. More often, they are simply adjusting to the fact that they cannot drink in the same way they did before.
The good news is that, with a few simple habits, it usually becomes much easier.
Why can something as simple as drinking suddenly feel different?
Following a gastric sleeve, gastric bypass or SADI-S, taking in a large amount of fluid quickly may no longer feel comfortable, particularly during the early stages of recovery.
Some patients also experience nausea or changes in appetite and thirst. Add in everything else you are learning about your postoperative diet, protein, medications and activity, and it is easy to fall behind with fluids without noticing.
Dehydration is something we take seriously in bariatric care. Research involving more than 250,000 patients undergoing sleeve gastrectomy or gastric bypass found that dehydration requiring treatment was associated with emergency department visits and hospital readmission.
That does not mean hydration needs to become a source of worry. It means we want patients to understand it and establish good habits early.
Forget the large glass. Think little and often
Patients sometimes tell me, “I just can’t get through that much water.”
My advice is not to look at the whole day’s fluid requirement as one big task.
You are not trying to drink a large glass at once. Small amounts, taken regularly across the day, are generally much easier to manage.
Your bariatric team will advise you on your individual fluid requirements. International bariatric guidance commonly refers to approximately 64 fluid ounces, or around 1.9 litres, per day, although individual requirements and postoperative plans can vary.
A few practical habits can make a real difference:
- Start your fluids early rather than trying to catch up later in the day.
- Keep your drink somewhere visible and within reach.
- Use a bottle with a known volume if that helps you keep track.
- Sip regularly rather than taking large drinks.
- Follow the guidance from your bariatric team about suitable fluids at each stage of recovery.
If you find plain water difficult to tolerate, let your bariatric team or dietitian know. There may be suitable alternatives depending on where you are in your postoperative plan.
You will need to rethink drinking with meals too
For many people, having a drink beside their meal is something they have done all their lives.
Following bariatric surgery, that habit needs to change.
BOMSS guidance recommends avoiding drinking with meals and leaving approximately 30 minutes between eating and drinking.
Initially, patients can find this one of the more awkward adjustments.
I usually reassure them that it becomes much more natural with time. What feels like a schedule during the first few weeks eventually becomes part of your normal routine.
Your body will usually give you a few clues
You do not need to become obsessed with measuring every millilitre you drink.
Instead, learn to recognise the signs that your intake may be falling behind.
A dry mouth, increasing thirst, headache, dizziness, unusual tiredness and urine that becomes noticeably darker or less frequent can all be signs that you need to pay attention to your hydration.
Vomiting or diarrhoea can increase the risk because you are losing fluids while potentially struggling to replace them.
I would much rather a patient contact us early because they are unsure than wait until they are feeling significantly unwell.
When is it more than just a difficult day?
There is an important difference between having a day when you have not quite reached your fluid goal and being unable to drink adequately.
Repeated vomiting, difficulty keeping fluids down, increasing difficulty swallowing or a significant drop in fluid intake should be discussed with your bariatric team.
Some days will require a little more attention
Warm weather, exercise, fever, vomiting and diarrhoea can all increase fluid losses.
Travel can catch people out too.
You may be walking more, sitting on a flight, spending time somewhere warmer or simply be out of your usual routine. If you are travelling after bariatric surgery, think about hydration before you leave rather than waiting until you become thirsty.
Eventually, you stop having to think about it so much
This is perhaps the reassurance I would most like to give someone preparing for bariatric surgery.
The early weeks involve a lot of learning.
Eating feels different. Drinking feels different. Your body is changing and you are trying to remember advice about nutrition, medication, activity and recovery.
It can feel like a lot at first.
But the patients I care for generally find that these new habits become increasingly normal. You learn what works for you. You recognise when you have not had enough to drink. And taking regular fluids becomes something you do without having to plan every sip.
The aim is not to be perfect. It is to understand your new body, build sensible habits and know when to ask for help.
At Blackrock WeightCare, we see bariatric surgery as much more than the operation itself. Preparing patients for the changes that come afterwards, and being there when questions arise, is an important part of bariatric care.
If you are considering bariatric surgery and would like to learn more about the treatment and ongoing support available at Blackrock WeightCare, complete the enquiry form here, or call us on 01 255 2479.
Your Health. We Care.
