In a wristwatch imagine the battery is in the strap and there's a medical sensor in there connected to the internet. If someone is monitoring that they could phone up if the user has forgotten to take some medication. This could save hundreds of dollars in medical fees later. What's missing? It's a stable battery.
I took anatomy classes. I went to medical libraries and talked to doctors and nutritionists. I did the whole thing before using myself as a human guinea pig.
I've never followed a vegan or vegetarian diet in the past but I think I could do it. It would not be easy. I have worked with nutritionists who have said a vegan diet is not necessarily all positive for your health because you need nutrients you only find in meats. I believe in a balanced diet.