OF THE
TIMES
Fatigue, insomnia, depression, anxiety, low libido, poor stress tolerance, dry skin, poor quality sleep, apathy, sugar and salt cravings, repeated infections, headaches, slow wound healing, menstrual irregularities, diarrhea, constipation, hair loss, palpitations, cold hands and feet, poor body temperature regulation, low blood sugar, increased effort to perform daily tasks, lack of energy, food intolerances, allergies, etc...Chiropractor and naturopath Dr James Wilson, building upon the previous work of pioneers in the field of stress physiology, including Hans Selye, claims to have coined the term "adrenal fatigue" in 1998. Since then, a whole host of books have been published on the topic, and a simple google search brings up more than 403,000 results.

Comment: Although surveys are highly unreliable (and there is no source link for this one in particular), a vegetarian diet lacks sufficient amounts of fat soluble vitamins, B12, iron and zinc which can lead to low energy and lack of activity between the sheets.
Why you should think twice about vegetarian and vegan diets