Based on a 4 years’ prospective study involving some 40.000 men and some 48.000 women, a decreased suicide risk was associated with a „prudent dietary pattern“ but not with Japanese or Westernized style of food habits.
Akiko Nanri et al., British J. of Psychiatry, doi: 10.1192/bjp.bp.112.114793
Healthy diet decreases suicide risk: epidemiological study in Japanese adults