Some Marines struggle to shed pounds now that the commandant of the Marine Corps is cracking down on overweight Marines. Joan Fitzgibbon, Naval Medical Center San Diego dietician says Marines shouldn't turn to quick fix diets that deprive their body of its proper nutrition. Instead Fitzgibbon suggests choosing a more successful alternative; changing their lifestyle. Marines should incorporate more physical activity and healthy food choices to make a difference. - Some Marines struggle to shed pounds now that the commandant of the Marine Corps is cracking down on overweight Marines. Joan Fitzgibbon, Naval Medical Center San Diego dietician says Marines shouldn't turn to quick fix diets that deprive their body of its proper nutrition. Instead Fitzgibbon suggests choosing a more successful alternative; changing their lifestyle. Marines should incorporate more physical activity and healthy food choices to make a difference.