This section is from the book "The Hygienic System: Fasting And Sun Bathing", by Herbert M. Shelton. Also available from Amazon: The Hygienic System Vol III Fasting and Sun Bathing.
Grief, worry, anger, shock and other emotional irritations are almost as potent in suspending the desire for food and in rendering digestion practically impossible as are pain, fever and severe inflammation. An excellent example of this is that of the young lady, in New York, who a few years ago attempted to drown herself and who explained, when rescued by two sailors, that when her sweetheart who had been in port two days had not called to see her nor communicated with her, she thought she had been jilted. Her sailor friend, kept on duty and not having opportunity to communicate with her, was permitted to see her. He asked when she had eaten and she replied: "Not since yesterday, Bill, I couldn't." Her grief or sense of loss had resulted in a suspension of digestive secretions and a loss of desire for food.