n8 HUMAN PHYSIOLOGY CHAP, ix 



6. Avoid extremes of temperature in foods, and hard, metal- 

 lic toothpicks, as they tend to injure the enamel. 



7. A natural appetite is a safe guide to follow in the selec- 

 tion of foods, but the appetite may easily become perverted. 



8. A cheerful disposition and a joyous nature give rise to 

 good digestion and perfect nutrition ; while worry, envy, jeal- 

 ousy, etc., lead to digestive disturbances that make good health 

 and happiness impossible. 



9. Foods should be eaten at regular intervals of several 

 hours, so that the digestive organs may have their needed rest. 

 Rest of a few minutes before and after full meals is a great aid 

 to digestion. 



10. Eat slowly, masticate well, drink little . at meals, be 

 cheerful and happy, and select plain, wholesome foods that are 

 well cooked, if you wish to be well and strong. 



11. Dress about the waist should fit loosely, so as not to push 

 out of place the abdominal and pelvic organs. All garments 

 should be suspended from the shoulders and not from a belt 

 worn about the waist. 



12. Dyspepsia, intestinal indigestion, and liver troubles are 

 among the common diseases of the digestive organs. They 

 come from unhygienic habits of eating, drinking, and living. 



13. Alcohol has a specific effect upon the stomach, intes- 

 tines, and liver ; it tends to impair their functions permanently 

 if used habitually. 



14. The large intestine should be trained to empty itself 

 every morning. 



