From all that has been mentioned, the importance of healthy eating, a balanced diet and hygiene can be understood in the light of the Qur'an and Sunnah. Islam has stressed on the importance of these things right from the start unlike health authorities etc., Which have just recently begun to stress its importance. This could be counted as just another gem that manifests the perfection of Islam.
To talk about Islam and the Qur'an and Sunnah
The duty of every Muslim man and woman and this is from God
God says in the Holy Qur'an ((125) Invite to the way of your Lord with wisdom and good instruction, and argue with them in a way that is best. Indeed, your Lord is most knowing of who has strayed from His way, and He is most knowing of who is [rightly] guidedghtly] guided
http://www.youtube.com/watch?v=-xkqSZMM7uc
http://www.youtube.com/watch?v=ewVZ6eMIhP0
Results and human hearts in God's hands