A keto diet may help improve severe mental health, metabolic symptoms

  • Severe mental health conditions challenge both patients and healthcare professionals with the metabolic side effects of antipsychotic medications.
  • A Stanford Medicine pilot study suggests that a ketogenic diet, when combined with standard medication, may improve both metabolic health and psychiatric symptoms in people with severe mental illnesses.
  • Despite these encouraging findings, experts emphasize the need for more comprehensive research, and recommend sticking with more sustainable dietary patterns.

Mental health conditions affect an estimated 57.8 millionTrusted Source or more adults in the United States. This includes severe conditions, such as bipolar disorder and schizophrenia.

Antipsychotic medications can be essential for symptom management but often lead to metabolic side effects such as weight gain and insulin resistance, negatively impacting individuals’ quality of life and sometimes causing treatment discontinuation.

Addressing these challenges, Stanford Medicine recently explored whether a ketogenic diet could enhance metabolic and psychiatric outcomes for patients with severe mental illness through a pilot study.

The ketogenic diet — high in fats, low in carbohydrates, and moderate in protein — has previously shown effectiveness in managing various conditions, including diabetesTrusted SourceobesityTrusted Source, and mental health disordersTrusted Source.

Now, Stanford Medicine’s pilot study had found that with standard medication and treatment, a 4-month ketogenic diet intervention may significantly improve symptoms and quality of life in people with severe mental illness and metabolic conditions.

The study appears in Psychiatry Research.

Studying the effects of the keto diet on mental health

This 4-month study involved 21 adults diagnosed with bipolar disorder (76%) or schizophrenia (24%) who were taking antipsychotic medication and were overweight or had a metabolic issue, such as insulin resistance.

Most participants were female (62%) and white (76%), averaging 43 years old.

As outpatients, participants received instructionz to follow a ketogenic diet with specific macronutrient ratios: 10% carbs, 30% protein, 60% fat.

Though they did not have to count calories, they were asked to consume a minimum of 1,200 calories daily, and limit their net carbs to about 20 grams per day.

Participants received a 1-hour training session, educational materials, ketogenic cookbooks, recipes, and a personal coach to help with diet adherence.

The diet instruction included daily vegetable, salad, and water intake recommendations, along with guidance on measuring blood ketone levels.

Researchers checked dietary compliance on a weekly basis via a blood ketone meter. The study included regular medical and psychiatric evaluations by a psychiatrist, with additional confirmation from participants’ personal psychiatrists where possible.

Participants maintained their usual psychiatric treatments and medications throughout the study.

Dual benefits for metabolic and mental health

Out of 21 participants, 14 strictly followed the ketogenic diet. Those who did showed less severe psychiatric symptoms, with fewer cases of schizophrenia and shorter illness duration compared to the semi-adherent group.

The semi-adherent group had higher obesity rates, worse cholesterol levels, and longer illness durations.

Medical News Today spoke with Uma Naidoo, MD, a nutritional psychiatrist and author, not involved in this research, who shared that “the specifics of the ketogenic diet may be a challenge for some individual[s] with these more serious illnesses to manage.”

This may explain why those with more severe conditions showed lower adherence to the diet.

Initially, 29% of participants had metabolic syndrome criteria, and over 85% had multiple medical conditions like obesityhyperlipidemia, or prediabetes. By the end of the study, no participants met the criteria for metabolic syndrome, suggesting the ketogenic diet’s positive impact on metabolic health.

On average, participants lost 10% in body weight and body mass index (BMI), 11% in waist circumference, 17% in fat mass index, and 6% in systolic blood pressure, alongside improvements in metabolic markers such as visceral fat, inflammation, HbA1ctriglycerides, and insulin resistance.

Higher ketone levels, suggesting greater diet adherence, correlated with better metabolic health.

Psychiatric improvements were notable, too, with a 31% decrease in mental illness severity, gauged by the Clinical Global Impressions ScaleTrusted Source.

Additionally, 79% of participants with symptoms at the start showed meaningful improvement in their psychiatric condition, especially those who strictly adhered to the diet.

Reported life satisfaction, overall functioning, and sleep quality also improved, emphasizing the diet’s wide-ranging positive effects.

The study results suggest the ketogenic diet may reduce psychiatric symptoms and counteract the metabolic side effects of antipsychotic medications.

However, Naidoo advised caution in interpreting the findings due to the study’s small size and the absence of a control group.

How does the keto diet improve mental health?

MNT also spoke with Jasmine Sawhne, MD, a board-certified psychiatrist not involved in the study, who elaborated on the ketogenic diet’s potential for improving mental health through altering brain chemistry and energy metabolism.

By shifting the brain’s energy source from glucose to ketones, the diet “can potentially improve mental health outcomes such as mood stabilization and cognitive function,” she explained.

Research suggests that this metabolic shift may also improve psychiatric symptoms by decreasing neuroinflammationTrusted Source and increasing levels of gamma-aminobutyric acid (GABA), a neurotransmitter that helps regulate mood.

Eliza Whitaker, MS, RDN, a registered dietitian nutritionist not involved in the study, emphasized the ketogenic diet’s anti-inflammatory propertiesTrusted Source, which could be crucial for combating mental health conditions, especially in cases that are resistant to treatment.

She noted that improvements in blood glucose and insulin sensitivity might also alleviate psychiatric symptoms connected to metabolic issues.

Additionally, ketosis may enhance mitochondrial functionTrusted Source and reduce oxidative stress, factors implicated in psychiatric disorders.

However, Whitaker cautioned about the need for further research to fully understand the ketogenic diet’s impact on mental health and mentioned the possibility of symptom reemergence upon stopping the diet.

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