Operation LAPIS: An Introduction

Gastric bypass is surgery to help you lose weight if you’re very overweight. It works by making your stomach smaller and bypassing part of your intestines (bowels), so you absorb fewer calories.

An image showing a diagram of the upper digestive system

About gastric bypass surgery

Gastric bypass can help you lose up to two-thirds of your excess weight within two years. One of the best ways to maintain a health diet is by using blood sugar formula.

To be considered for a gastric bypass, you need to be fit enough to have an anaesthesic and surgery. You must also be committed to having long-term follow-up appointments and to follow instructions of specialists at Doctor To You’ about your lifestyle and diet after your operation. To assess this, and your suitability for surgery, you’ll need to have a psychological assessment.

You should be able to keep the weight off for up to 10 years. But its success will depend on the lifestyle changes you make after the operation. You’ll need to:

  • make changes to your diet, such as avoiding snacking and choosing healthier options
  • avoid drinking too much alcohol
  • take regular exercise

Suitability of gastric bypass surgery

You may be offered weight loss surgery if you:

  • have a body mass index (BMI) of 40 or more
  • have a BMI of 35 to 40 and a condition, such as type 2 diabetes or high blood pressure, which could get better if you lose weight

You’ll usually only be considered for surgery if you’ve tried to lose weight in other ways and this hasn’t worked. But you may be offered a gastric bypass straightaway if you have a BMI of more than 50.

You can work out your BMI using our BMI calculator.

Like all types of weight loss surgery, a gastric bypass isn’t generally recommended for children and young people. So, you must be over 18 to be able to have it.

Even if you meet all of the above criteria, you may still not be able to have the procedure, due to high demand. If your GP thinks you may benefit from surgery, they may refer you to a specialist weight management service to discuss the different options available. If you don’t meet the criteria for NHS funding, you may be able to have the surgery privately.


  1. I’ve been reading about Operation LAPIS on your blog, and it looks exciting and well-executed. A question about the LP grading system: how apparent is it to students what their current grade is, vs. what they can achieve based on progress to date and remaining assignments? Trying to shift the focus to the collaborative process sounds like a good idea, but then you may lose the ingrained extrinsic motivation of grade-grubbing. Our initial case study suggested that students who were naturally highly grade motivated did not like building from an F towards an A. It made them uncomfortable.

  2. Author

    Max, that’s a great question, thanks for asking it here.

    Part of the explanation lies in a (necessary) culture shift in the classroom. When the end goal becomes not about the grades, but rather the learning process, really wonderful things start to happen. For those students who do obsess over grades, their personal dossier (a spreadsheet via Google Docs) is constantly updated to reflect their latest Latinity Point awards.

    They aren’t working from an ‘F’ to and ‘A’– I haven’t framed it as “here is the total number of LPs you need to get to by the end of the semester.” Rather, at any given time they can just take their current LP total and divide it by the maximum number of LPs possible (to date) to figure out where they stand percentage wise.

    A pretty powerful psychological thing happens when a student receives an assessment back with a +150 LP on the top, rather than a 75%. Rather than focusing on the negative of getting a quarter of the items wrong, they instead focus on what they gained towards their progress through the course.

    I won’t argue that the extrinsic motivation of grades is powerful for certain types of students but far too often that motivation focuses on the letter at the top of the page rather than the learning process to achieve that letter.

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