Why Water, Fluids, and Protein Are Vital After Weight Loss Surgery

Water and protein are a vital part of your diet and recovery after bariatric surgery. Discover the important roles they play in your bariatric recovery.

woman's hands pouring water from pitcher into glass

Updated March 12, 2026

By Lisa Shaw, RN, MSN, MBA, CBN, Director, Digestive Health Surgery Programs, Virtua Complete Weight Management Program

Weight loss surgery, also known as bariatric surgery or metabolic surgery, is a type of surgery that adjusts your digestive system primarily to promote weight loss, which in turn may help prevent high blood pressure or heart disease associated with obesity.

You might be considering, or preparing for, weight loss surgery. If so, you may want to learn more about your diet prior to bariatric surgery. If you’ve already had weight-loss surgery, here are some tips for your post-bariatric surgery diet.

In this article, we’ll dive deeper into the specifics of the post-surgery diet and how it promotes healthy weight loss.

The Importance of Water After Bariatric Surgery

Water is key to a positive recovery from weight loss surgery. Not only does it keep things moving and help eliminate waste from the body, but it also keeps your hair, skin, and other body cells hydrated.

Follow these guidelines to ensure you stay hydrated after surgery:

Drink 50 to 64 ounces of non-carbonated water/liquid per day.
Do not drink more than a maximum of 16 ounces of caffeinated beverages per day. No caffeine for 6 weeks after surgery.
If you drink coffee or tea, what you add to it should be sugar-free and fat-free.
Carry a water bottle with you at all times.
Set a timer for every 10-15 minutes to help you get used to the new pattern of sipping.
Track your fluid intake every single day.
Stop drinking fluids 15 minutes before a meal.
Do not drink fluids with your meal as this quickly flushes food through your stomach.
Resume drinking liquids 30 to 60 minutes after your meal.
Keep an eye on your urine—if you are properly hydrated, it should be very light.

The Importance of Protein After Bariatric Surgery

Protein should be included in all of your meals after surgery because it provides a number of benefits that support your weight loss and recovery including:

Aiding in proper wound healing after surgery
Helping keep your skin, hair, bones and nails healthy
Helping form hormones, enzymes and immune system antibodies that help your body function effectively
Helping your body burn fat instead of muscle for healthier weight loss
Supporting your metabolism so you lose weight quicker
Helping curb hunger between meals

Since bariatric surgery reduces the capacity of the stomach to a very small volume, high-protein foods should always be eaten first — or you may become too full to eat them.

Liquid Protein Helps You Meet Your Daily Requirements

It’s difficult to consume enough protein from foods alone during the first several months following surgery. Many people choose to add liquid protein supplements to their diet post-surgery to meet the daily protein requirements. they might also continue to include supplements in their ongoing diet as a balanced, convenient protein source.

As you follow your post-surgery nutrition guidelines, keep in mind that plants alone do not provide “complete” proteins. A complete protein is an essential amino acid that’s found mostly in animal sources. Plant proteins should be used together with animal protein sources to provide you with all of the essential amino acids you need. When choosing animal proteins, choose lower fat, lean meats like skinless chicken or turkey, pork chops or loin, and beef sirloin or round.

Protein Goals After Weight-Loss Surgery

Your recommended fluid, food, and supplement intake  will vary depending on your individual needs, your surgery type, and the bariatric diet prescribed by your surgeon or dietitian. However, basic guidelines include an average of 60 to 80 grams a day for women and 70 to 90 grams a day for men. Those who have had a duodenal switch procedure, however, will require approximately 100 grams daily.

It’s important to remember that more is not always better. Try not to exceed the range of recommended daily protein, unless instructed to do so by your physician or dietitian. Excess protein intake will result in excess caloric intake, and any excess calories that are not burned are stored as fat — which is not an ideal outcome post-surgery.

Want to take the next step? Speak with a weight loss specialist

If you’re looking for step-by-step guidance along your weight loss journey, we’ve got you covered. Virtua’s Complete Weight Management Program personalizes the process, working with you at every step to build a plan that works best for you and your goals.

Learn more about the Complete Weight Management Program and make an appointment with a weight-loss specialist today.