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184 points yeatsy | 2 comments | | HN request time: 0.459s | source

Hi HN,

I’m Joshua, a student, and I’m excited (and a little nervous) to share something deeply personal that I’ve been working on: Islet, my diabetes management app powered by GPT-4o-mini. It’s now on the App Store, but I want to be upfront—it’s still very much in its early stages, with a lot more to go.

I was diagnosed with Type 1 diabetes while rowing competitively, and that moment changed everything. It wasn’t just the practical challenges of managing insulin, carb counts, and blood sugars; it fundamentally shifted how I see myself and the world. It forced me to slow down, prioritise my health, and take control in ways I never had to before. My outlook on life became more focused on resilience, adaptability, and finding solutions to problems that truly matter.

This app started as a pet project over the summer, a way to see what I could create using ChatGPT and explore the potential of LLMs to help with real-world challenges. At first, it was just about making my own diabetes management easier—understanding patterns in blood sugars, planning meals, and adjusting routines. But as I worked on it, I realised it could do more.

Right now, Islet offers personalised meal suggestions, tracks activity, and provides basic insights based on the data you enter. It’s far from complete. Even so, the process of building Islet has already taught me so much about how powerful AI can be in creating personal, meaningful tools.

This project is deeply tied to how my diagnosis changed me. It’s about more than managing diabetes, it’s about showing how anyone, even a student experimenting over the summer, can use AI to potentially solve real, personal problems. I believe tools like LLMs have the power to democratise solutions for all, making life just a bit easier for all of us.

If you’re curious, you can check it out here: https://apps.apple.com/gb/app/islet-diabetes/id6453168642. I’d love to hear your thoughts what works, what doesn’t, and what features you think would make it better. Your input could help shape the next steps for Islet.

Thanks for reading !

joshua

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lukko ◴[] No.42172166[source]
Hey, I'm a doctor and work in a similar area. I really like the name and well done on shipping. You can tell the app is made by a patient who suffers from the condition, which is amazing.

I would be really careful in this area though, especially using ChatGPT to generate suggestions. This to me this does venture into medical device territory, based on the intended use. Check the guidelines here https://www.gov.uk/government/publications/medical-devices-s... - UK specific, but will be similar for FDA.

Honestly, I would seek proper consultancy advice, remove any suggestions / recommendations for now, and just have it as a data-logging platform. The disclaimer unfortunately will not stand up.

Congratulations on getting this far - I really hope you continue on this path, just make sure you are on firm ground.

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Adirael ◴[] No.42173360[source]
I don't know, I understand the advice and I guess that's probably one of the reasons Loop (https://loopkit.github.io/loopdocs/) is not on the App Store. If they had turned their project into another data-logging platform we wouldn't have commercial closed loop systems.
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1. lukko ◴[] No.42174473[source]
Thanks for the link. Yep - exactly, they took a leap, but importantly didn't release a full product / package on the App Store, or charge for features. This falls much more into a grey area, but is clearly DIY, and demonstrates demand/need for the commercial / regulated systems.

Especially when the problematic features are charged for, it gives the recommendations / suggestions an air of legitimacy which could be dangerous.

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2. pimeys ◴[] No.42176565[source]
A lot of the research from Loop and AndroidAPS is used in commercial closed loop platforms; many of the people working for these open source utilities also work for medical companies.

So you either get lucky and your doctor can prescribe you a commercial loop, or you compile one from source.