Gastric Bypass Diet

Gastric Bypass Diet: What to Eat after Obesity Surgery?

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More about what you can eat after your Gastric Bypass Surgery.

Gastric Bypass Diet

Gastric Bypass Diet: What can I eat after the surgery?

Immediately after your gastric bypass surgery, you will be asked to drink only clear liquids, and to drink small amounts (60 to 90 ml) at a time. Once you manage the clear liquids easily, you can bring in other liquids such as low-fat milk.

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Gastric Bypass Diet
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Gastric Bypass Diet

What can you drink after a Gastric Bypass Surgery?

  • Unsweetened juice
  • Decaffeinated tea or coffee
  • Skim or 1% milk
  • Sugar-free gelatin or popsicles

An important focus after your surgery is to drink enough water: up to 2 litres between meals. Water helps your body get rid of toxins and waste products, and it facilitates the weight loss process.

Gastric Bypass Diet

When will I be allowed to eat normally after my weight loss surgery?

After weight loss surgery, gastric bypass diet recommendations vary, depending on your personal situation. Starting with liquids is common as part of a staged approach towards having solid foods again. Depending on how fast your body is healing, you will be making small adjustments to your diet. It’s common to get back to regular foods after about 3 months (after you have had the gastric bypass surgery).

When we help our Perth patients with gastric bypass diet recommendations, we try to underscore the importance of drinking enough fluids to avoid dehydration, particularly during the typical hot months in Perth and WA. We also recommend to become more aware of your body, and to detect when you feel hungry, or when you feel you are full.

Gastric Bypass Diet

Can I have red meat after a Gastric Bypass Surgery? Soft drinks? Cheese or snacks?

Our team at Advance Surgical Perth is available to answer your FAQs about bariatric surgery in general, and about gastric bypass diet recommendations. The key is to stick to a staged approach, going from liquid to solid in a 3-month timeframe. Once you tolerate liquids, you can bring in strained, mashed up and pureed foods.

Foods you can puree in this phase:

  • Eggs
  • Fish
  • Cottage cheese
  • Beans
  • Lean ground meat
  • Soft fruits
  • Cooked vegetables

Your dietitian or nutritionist will recommend you to avoid red meat, carbonated drinks or snacks in between meals.

Gastric Bypass Diet

Can I drink with meals after my Gastric Bypass Surgery?

No. It’s better to drink large amounts of water in between meals to improve your weight loss results. We recommend up to 2 liters of water in between meals, and knowing that our climate in Perth can get pretty hot, it’s important to avoid even the slightest dehydration after your weight loss surgery. Drinking too much with your meals can cause symptoms such as nausea and vomiting, so avoid drinking much around your meals. It may prevent you from absorbing enough nutrients, if you feel full because of all the water.

A gastric bypass diet is always adapted to your personal situation. Depending on how your body heals, your weight loss surgeon at Advance Surgical and the dietitian will always help you make well informed decisions about the pathway back to eating normal foods. Foods that may cause discomfort after the surgery are bread, meat, fried foods, raw vegetables and soft drinks.

If you want to know more about the post weight loss surgery diet, and how our team at Advance Surgical will assist you through this transition, give us a call so we can answer any questions or concerns you may have.

Perth bariatric surgeon


At Advance Surgical, Mr Jon Armstrong and the team help people who want to lose weight through bariatric surgery, suffer from an endocrine disorder or need general surgery.

Bariatric surgeon Perth


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Established in 2005

When we established Advance Surgical our motivation was to help those who find that diet and exercise are simply not working for them.

The cost of bariatric surgery

We understand the cost of bariatric surgery may be an issue. We have changed our pricing to be more affordable. Payment plans available.

Team of specialists

Mr Jon Armstrong, Medical Director and Founder alongside the team at Advance Surgical, have helped thousands of people in Perth.