Preparing for surgery: the weeks before, the diet, the day before
The weeks before an operation are the ones you have most control over. Loopa's pre-op track counts down to your date and puts each stage in front of you as it arrives.
Six weeks out
If you smoke, this is the window to stop. The perioperative care guideline is unambiguous and it is one of its stronger recommendations: "Tobacco smoking should be stopped at least 4 weeks before surgery" (Stenberg E et al., World Journal of Surgery, 2022 · doi:10.1007/s00268-021-06394-9). Where there is alcohol misuse, the same guideline says abstinence should be maintained for one to two years (Stenberg E et al., World Journal of Surgery, 2022 · doi:10.1007/s00268-021-06394-9).
Start moving now. The published activity guidance for these patients begins before surgery, not after it. Its first recommendation is to begin a physical activity intervention pre-operatively (Fernández-Alonso M et al., Surgery for Obesity and Related Diseases, 2025 · doi:10.1016/j.soard.2024.11.005).
Ask your team for their written medication list. Several classes are usually discussed before an operation: blood thinners and antiplatelets, anti-inflammatory painkillers, fish oil, some diabetes medicines, and weight-management medicines. Loopa never supplies a stop date for anything. Ask your team for theirs, in writing, and follow it.
Your team may screen your vitamin levels. Ask what they want checked, and whether they want anything corrected before the date.
Building the habits now
Every one of these is something you will be doing afterwards anyway, and every one is easier to learn before an operation than in the fortnight after one.
- Protein first at every meal
- Around 64 fl oz of fluid a day, roughly the more than 1.5 liters the published guideline puts adequate hydration at (Mechanick JI et al., Obesity, 2013 · doi:10.1002/oby.20461)
- Drinks kept about half an hour away from meals
- Twenty to thirty chews a bite
- Nothing carbonated, and no straws
- A walking habit you already have, rather than one you intend to start
The pre-operative diet
Most teams set a high-protein diet in the last week or two. A common shape is two high-protein meal replacements a day (at least 20 g of protein and no more than 5 g of sugar a serving) plus one meal of lean protein with non-starchy vegetables and one or two protein or vegetable snacks.
No anti-inflammatory painkillers, no fish oil and no herbal supplements during it unless your team has approved them.
Your team sets the length. Seven days is common. Yours is whatever they wrote down.
The day before, and fasting
Sugar-free clear liquids only: water, sugar-free flavored water, zero-sugar electrolyte drinks, sugar-free gelatin and ice pops, low-sodium broth, decaf tea or coffee with nothing in it. No supplements that day. Medicines exactly as your nurse instructed.
Follow the fasting time your anesthesia team gave you. The published guidance is solids until six hours before and clear liquids until two hours before induction (Stenberg E et al., World Journal of Surgery, 2022 · doi:10.1007/s00268-021-06394-9), but your team's own instruction outranks it.
The practical list
A shaker bottle. A one-ounce measuring cup. Room-temperature water. Loose clothes. A pillow for the drive home. A walking plan for the first few days.
Related
Where this comes from
Everything on this page is drawn from published clinical guidelines and peer-reviewed research, cited above. The full list, with a link to every original, is at loopahealth.app/sources. Loopa does not give medical advice. It does not decide whether a procedure is right for you, does not recommend one over another, and never sets a dose. Your care team does all three, and where they give you an instruction, theirs is the one to follow.
