Manuel Castro

Manuel Castro

Cofounder @ Napkin Math

About

Building Napkin Math - the personalized AI food journal that builds a nutrionist in your pocket.

Badges

Tastemaker
Tastemaker
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Veteran
Gone streaking
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Gone streaking 5
Gone streaking 5

Maker History

  • Napkin Math
    Napkin Mathpersonalized AI food journal + nutrition coach
    Jun 2026
  • 🎉
    Joined Product HuntAugust 17th, 2019

Forums

What's your favorite food hack?

Eating fiber first to feel more full! I just down my veggies and then eat the rest of my meal and it makes such a big difference.

•

4mo ago

What are the 5 tools you simply couldn't do your work without?

This could be related to your industry, or even a side project you're working on.

Here are my 5 (I couldn't function without them):

  1. Grammarly proofreading my texts, not just posts, but also client communication

  2. ChatGPT / Claude mostly brainstorming, help with copy, and summarising

  3. Figma I can put the basic graphics together quickly.

  4. Translator sounds incredibly old-school, but English is not my mother tongue

  5. Gmail and not only for communication, but also for storing ideas and sending myself email reminders for posts

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5mo ago

How do busy founders “reset” during weekends, holidays, or vacations?

So far, the impression I have of this community and maker circles is that you work every day.

Which is great, it s one of the reasons I m here.

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