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a mental condition in which a person believes s/he has abnormally low levels of blood sugar without having any real physical symptoms; a person diagnosed with the state or condition of psychohypoglycemia is called psychohypoglycemic
Brenda's psychohypoglycemia keeps her from eating some very delicious desserts.

Because Jerry believes he has low blood sugar, but really does not, his psychiatrist labeled him as psychohpyoglycemic.
by Dr. K. L. Burke May 31, 2007