About this site
- Site name
- Diet Diary
- URL
- https://diet-diary.nacn.app/en/
- Operator
- nacn
- Launched
- October 2026
- Price
- Free (no account or install needed)
Why I made this site
Everyone knows that eating less helps you lose weight, but it's hard to get a feel for how fast your weight actually changes. Real diets also run into real-life obstacles: strict cutting builds up stress until you give up, and rain or weekends throw off your workout plans.
Diet Diary turns that whole journey into a casual game where you raise a pixel-art character. You can see how your choice of meals and exercise each day changes your weight, based on calorie balance calculations.
About the calculations
BMR, exercise calories, and BMI categories are based on formulas and standards used in public health resources and research. The formulas and sources are listed on How the Math Works.
That said, the numbers in the game are only estimates. This site is not medical advice and is not intended to diagnose, treat, or give individual health guidance. Talk to a doctor, registered dietitian, or other health professional about real weight loss and health decisions.
Contact
Please send feedback, comments, or bug reports about Diet Diary through the contact form below.
The form's questions are in Japanese, but messages in English are welcome.
I'll review messages and reply as time allows. I may not be able to reply to every message. Any personal information you include will be used only to reply to you.
Related pages
- How to Play
- How the Math Works
- Privacy Policy (ads, analytics, and disclaimer)