In Episode 60 (23 July 2026), Robyn Dobbins had me as a guest on her Ketobiography podcast. If you’re coming from there, here are a few pointers to try out the simulator demonstrated in the episode:

Quick start

The simulator works best on a desktop view, as the controls and the simulator take up quite a bit of screen real estate.

  • Start on the Simulation page with an empty day.
  • On first visit you’ll see a tour that describes the main options
  • You can repeat the tour any time by clicking the compass 🧭, top right of any page that has a tour
  • Directly under the compass, you find a question mark on some pages, which will reveal a lot more explanation about the current page.
  • Click “Run”, then click individual meals from the meal-selector and watch what they do to your blood sugar and insulin levels

More control

  • Once the 16-hour simulation finishes, or when you pause, you can change the metabolic profile, e.g. between “Healthy”, “Prediabetic” or “Diabetic” presets
    • You can also create your own metabolic profile, in which you can include additional insulin injections. Simply start with one of the presets and save it. Pick a name to describe it.
  • If you prefer to pre-plan a day, rather than interactively clicking on meals: Check out the Day Plans.
    • Day Plans are also required for the longer time projections/reports
    • You can save an interactive simulation, once it’s completed, as a new day plan. As an interactive simulation spans 16 hours, you’ll typically set the start time offset when you save it as day plan
    • The multi-week report (Projection) has recently been updated, and is considerably more useful than when we recorded the podcast a couple of weeks ago.

There are some articles available that describe more options with the simulation:

Articles about the simulator

A plate of meat, tofu and vegetables - with a fork lifting out a piece of meat
Protein Requirement Calculator - First Extension

A quick response to the protein requirement calculator: now with more than 7100 foods and dishes to choose from - in the glucose-insulin simulator too

A plate of meat, tofu and vegetables - with a fork lifting out a piece of meat
Protein Requirement

Protein requirement looks like a matter of opinion - but there is a way to get at harder facts, and to tell proteins apart

An old black-and-white photo of a man in a lab coat, standing in front of a machine
Calibrating the Simulation

A rather dry look under the hood: About the scope, options and limits of the simulation that’s found on this site. For Nerds, who want to know what’s going on.

A screemshot of the glucose/insulin simulation available on this site
Welcome, Boundless Body Radio listeners

If you’re here because you listened to my episode on Boundless Body Radio, you might want to start here. Others find a quick introduction to the site, and an awesome podcast to subscribe to and listen.

Share Your Simulation

You can now easily share your simulation with others

A small child at the bottom of a very large stone staircase
First steps with the simulation

A suggestion for how this site delivers results quickly, and how to discover its features

More to explore

While you’re here, check my perspective on various nutritional topics in the Blogs section. Most of them are available in either English or German. And note that there’s an RSS feed to subscribe without leaving an email address.

One more thing I didn’t mention on air: There are a couple of easter eggs hidden on the site and in the simulator. It’s worth poking around to find them - either anonymously or collect them by creating an account (no email required) to keep score. Have fun!

The video version of the full episode can be found on YouTube (screenshare with this site starts at 47:37), and Robyn has been kind enough to also create an excerpt with just the screencast, which I’ll embed here:

See How Food Affects Blood Sugar and Insulin in Real Time | butterbei.de Demo
A short excerpt from the full episode, with just the screenshare as introduction to the simulator

Help improve the simulation

If you’re wearing a continuous glucose monitor and consider sharing some information, please use the feedback button bottom right to get in contact and help tune the algorithm: I’m certain that the numbers make sense (e.g. go roughly into the correct direction), but the peaks currently might be too high, low or the timing might be off.

And, of course: If this is useful for you, or if you know someone whom it will be useful for: Please share the links to this site and to Ketobiography.

Quick recap of my personal story

An old sign reading 'Salvage & Sawdust'

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