Reducing multimorbidity in metabolic syndrome

Could a 'low-carbohydrate, healthy-fat' diet approach be the key to helping this patient?
Weight woman

Mary, a 58-year-old woman on a disability pension, has complex multimorbidity encompassing bipolar disorder, PTSD, chronic back pain and morbid obesity.

She presents to her GP complaining that she is unable to lose weight and her quality of life is poor. In her own words, Mary is ‘ready to lie down and die’.