Intermittent Fasting Benefits and Risks

We were curious about what intermittent fasting actually does for our body, so we researched the scientific benefits and potential risks of intermittent fasting and found out that while it offers significant health improvements, it isn't a "magic fix" for everyone. Here is a summary of the findings.

Key Health Benefits

• Weight Loss: This is the most consistent benefit. Research shows participants can lose about 8% of their body weight over six months. Intermittent fasting may also be more sustainable than traditional calorie cutting indicated by a 2025 study.

• Heart Health: A 2025 clinical trial showed fasting can lower blood pressure and improve cholesterol levels (triglycerides and LDL), primarily by reducing visceral fat.

• Diabetes & Blood Sugar: By increasing insulin sensitivity and triggering autophagy (a cellular "cleanup" process), studies show fasting can help manage type 2 diabetes. Important: Most research stresses that while the potential to manage or reverse diabetes is real, it carries a significant risk of hypoglycemia (dangerously low blood sugar) if medications are not professionally adjusted.

• Brain Health: While human evidence is still emerging, studies suggest benefits for those with epilepsy, Alzheimer’s, and multiple sclerosis by strengthening neural networks.

Risks and Considerations

Although some studies have suggested benefits of intermittent fasting, others point out some of the risks.

• Muscle Loss: Fasting can lead to a loss of lean body mass such as muscle. Experts recommend resistance training and higher protein intake to counteract this.

• Who Should Avoid It - Experts suggests these people should avoid intermittent fasting:

  • Frail older adults.

  • People with a history of eating disorders

  • Pregnant or breastfeeding women

  • Individuals on insulin

• Hormone Myths: Contrary to social media claims, research shows no significant sex hormone disruptions in most women who practice time-restricted eating.

How to "Fast Smarter"

Experts suggest that intermittent fasting should be part of a comprehensive healthy lifestyle including exercise.

1. Prioritize Hydration: Only fast from calories, not liquids.

2. Focus on Nutrition: Use eating windows to consume fiber-rich whole foods and adequate protein.

3. Be Patient: It typically takes two to four weeks for the body and brain to adapt to the new rhythm and for hunger pangs to subside.

Next up in the According to Science Series: Can Exercise Help Lessen the Risks of Drinking Alcohol?