Dietary norms and the underlying spiritual science

For individuals to lead a healthy and happy life, Vedic and other scriptures have recommended certain dietary norms; however, over the past 100 years or so, we have forgotten the importance of those recommendations and hence, ignored these norms. In fact, humanity has forgotten several major and minor dietary norms such as not eating unless hungry, not eating at times other than the stipulated mealtimes, making seasonal changes in diet, not eating food given by those who have earned it by unrighteous means, etc. Some of these norms and their underlying science have been elaborated in this Holy text. If we follow these norms strictly, there will be no need to go to a doctor for health reasons.