Precious Thing and Food -FRUITS. - The contents of fruit As the interest in nutrition increases and people are getting more and more conscious about what they eat, the interest in fruit and its contents also grows. But we still don't know that much about fruit and there is much to discover about the substances that fruit contains. We know it is healthy for us, and that people who are sick can be cured by a diet of raw fruits and vegetables. Even cancer can sometimes be cured by this diet but which substances fruit contains is a mystery. That a human being can live healthily on fruit alone has been proven by the fruitarians, they only consume fruit. On this page we treat the following subjects: Water in fruit; The burning process & sugar in fruit; Proteins.