Health app concept

This app is totally to reflect on yourself and not show pictures of others. My idea is to have an app where you take a picture of yourself and can match up or write down what you did or what you ate and cause a reaction to your body. You might at something you normally would not eat and the next day get a rash or pimples. You can write it down for yourself as a reminder. You could write down your allergies and more. Also would like to implement the barcode search tool which search full info of any product and can show if you could be allergic to it. Also of course you could take a pic of yourself eating the product and will show up your reaction to it to remind you that it could be unhealthy for you.