Write to shiyin@quellecode.de. This is a one-person operation, so replies usually take a day or two.
Shiyin is a food and symptom diary for people trying to work out which foods line up with their gut reactions. It covers Chinese ingredients and seasonings in detail — soy sauce, doubanjiang, oyster sauce and the like — because most existing apps do not.
It is a record-keeping tool. It does not diagnose anything and cannot tell you whether you have a particular condition. What it can do is turn scattered impressions into an organised record you can take to a doctor.
A food needs at least five separate records before any pattern is worth mentioning. Below that, coincidence dominates. Foods you eat almost every day are also set aside — if a variable never changes, it carries no information.
This is deliberate. A statistical association only ever gets a food to yellow. Red requires you to actually complete a pause-and-reintroduce test, because correlation on its own is a poor reason to cut something out permanently. Over-restriction has real nutritional costs.
If you always eat them together, no amount of data can separate them — the app says so rather than guessing. Telling them apart means changing one thing at a time.
You can add your own ingredients in the app, and you can submit a correction from any ingredient's detail page. Corrections are stored on your device; you can export them and email them to us if you would like the built-in database fixed.
Yes, completely. Granting access only saves you from typing sleep and exercise in by hand.
Everything is on your device only. Use Settings → Data → Export backup to save a JSON file, then import it on the new device. There is no cloud sync at the moment.
Swipe to delete individual records, or clear everything at once in the app's data settings. Deleting the app removes all of it as well. We hold no copy.
Please do not use the app to work around symptoms that need proper attention. Blood in the stool, black stools, unintended weight loss, persistent vomiting, difficulty breathing, or throat tightness all warrant medical care rather than dietary detective work.
来信请发 shiyin@quellecode.de。这是一人开发，回复通常需要一两天。
食因是一个饮食与症状记录本，给想弄清楚哪些食物和自己肠胃反应对得上的人用。它对中式食材与调料的覆盖比较细——生抽、豆瓣酱、蚝油这些——因为大多数现有应用都没有。
它是记录工具。它不诊断任何疾病，也无法判断你是否患有某种病症。它能做的，是把零散的印象整理成一份可以带去门诊的记录。
一种食物至少要有五次独立记录，任何规律才值得一提。低于这个数，起主导作用的是巧合。几乎天天吃的食物也会被搁置——一个从不变化的变量，不携带任何信息。
这是刻意的。统计关联最多只能让一种食物到黄灯。红灯需要你真正完成一次「暂停—再吃」的排查，因为仅凭相关性就永久剔除一样东西是很糟的理由。过度忌口有实实在在的营养代价。
如果你总是同时吃它们，再多数据也分不开——应用会直说，而不是猜一个。要分辨只能一次只改一个变量。
你可以在应用里自建食材，也可以在任一食材的详情页提交纠错。纠错内容保存在你的设备上；如果希望内置库得到修正，可以导出后发邮件给我们。
完全可以。授权只是省去手动输入睡眠和运动的麻烦。
全部只在你的设备上。用「设置 → 数据 → 导出备份」存成 JSON 文件，然后在新设备上导入。目前没有云端同步。
单条记录左滑删除，也可以在数据设置里一次清空。删除应用同样会一并删除。我们没有任何备份。
请不要用这个应用去绕开真正需要处理的症状。便血、黑便、非计划的体重下降、持续呕吐、呼吸困难、喉咙发紧，这些都需要医疗处理，而不是继续在饮食里找原因。