What Is Intermittent Fasting & How It Works | SPARSH Hospital

Published in : Nutrition | September 5, 2025 |

Intermittent Fasting: What Is It, and How Does It Work?

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Intermittent Fasting (IF) is more than just the latest health trend—it’s a structured approach to eating that can lead to significant health improvements. Instead of focusing on what you eat, intermittent fasting centers on when you eat. Backed by research, it has become a popular choice for weight management, metabolic health, and even improved brain function. At Sparsh Hospitals, the Best Nutrition and Dietetics Hospital in Bangalore, we help patients incorporate intermittent fasting safely and effectively into their lifestyle.

What is Intermittent Fasting?

What is Intermittent Fasting exactly? It’s an eating pattern that cycles between periods of eating and fasting. Rather than dictating specific foods, intermittent fasting dictates time windows for food intake. During the fasting period, you either eat nothing or consume very few calories, allowing your body to rest and reset metabolically.

Intermittent fasting is not a diet in the traditional sense—there are no strict meal plans or calorie-counting. Instead, it’s a way of scheduling meals to maximize your body’s natural rhythms. This method has roots in human history, where people naturally fasted when food wasn’t readily available.

How Does Intermittent Fasting Work?

Understanding how intermittent fasting works begins with knowing how the body processes food. When you eat, your body uses glucose from carbohydrates for energy. Any excess glucose is stored as fat. When you fast, insulin levels drop, prompting the body to switch from using glucose to burning stored fat for energy.

This metabolic switch is what drives many of the intermittent fasting benefits, including weight loss and improved metabolic health. During fasting, growth hormone levels rise, cell repair processes intensify, and insulin sensitivity improves—all of which contribute to better overall health.

Intermittent Fasting Times and Schedules

There are several ways to practice intermittent fasting, and the ideal schedule depends on your goals and lifestyle. Common intermittent fasting times include:

1. 16:8 Method

You fast for 16 hours and eat within an 8-hour window. For example, you might eat from 12 pm to 8 pm and fast from 8 pm to 12 pm the next day. This method is easy to adopt and popular among beginners.

2. 5:2 Diet

Eat normally five days a week, and limit calories to about 500–600 on two non-consecutive days.

3. Eat-Stop-Eat

This involves a 24-hour fast once or twice a week. For instance, you might finish dinner at 7 pm and not eat again until 7 pm the next day.

4. Alternate-Day Fasting

You alternate between days of normal eating and fasting or minimal calorie intake.

5. Warrior Diet

You fast for 20 hours and eat one large meal in a 4-hour window, often in the evening.

Each approach can be tailored with the help of the Best Nutritionist and Dietitian in Bangalore to ensure it aligns with your health needs, fitness goals, and medical conditions.

Intermittent Fasting Benefits

Intermittent fasting benefits are backed by both modern research and centuries of anecdotal experience. Here are some well-established advantages:

1. Weight Loss and Fat Burning

Fasting increases fat-burning hormones and reduces insulin levels, helping the body burn stored fat more efficiently.

2. Improved Insulin Sensitivity

Fasting can significantly reduce insulin resistance, lowering the risk of type 2 diabetes and helping people with prediabetes or metabolic syndrome.

3. Heart Health

Intermittent fasting may reduce markers associated with heart disease, including blood pressure, cholesterol, triglycerides, and inflammatory markers.

4. Enhanced Brain Function

Fasting stimulates brain-derived neurotrophic factor (BDNF), which supports cognitive function and may protect against neurodegenerative diseases.

5. Hormone Regulation

Intermittent fasting improves the balance of key hormones like insulin, ghrelin (hunger hormone), and leptin (satiety hormone), helping regulate appetite and metabolism.

6. Cellular Repair and Longevity

Fasting triggers autophagy—a process where the body cleans out damaged cells and regenerates new ones, possibly contributing to anti-aging effects.

Who Should Avoid Intermittent Fasting?

While intermittent fasting offers many health benefits, it’s not suitable for everyone. You should consult the Best Nutritionist and Dietitian in Bangalore before starting if you:

  • Are pregnant or breastfeeding
  • Have a history of eating disorders
  • Suffer from diabetes or blood sugar regulation issues
  • Are underweight or malnourished
  • Take medications that require food intake

Medical supervision ensures that fasting is done safely and doesn’t interfere with essential nutrient intake or preexisting health conditions.

Tips for Starting Intermittent Fasting

If you’re new to intermittent fasting, here are a few tips to ease the transition:

  • Start slowly: Begin with a 12:12 or 14:10 fasting schedule and increase gradually.
  • Stay hydrated: Drink plenty of water, and herbal teas during fasting periods.
  • Eat nutrient-rich meals: Focus on whole foods—lean proteins, healthy fats, vegetables, and complex carbs—during eating windows.
  • Avoid binge eating: Don’t overcompensate during eating windows.
  • Listen to your body: Fatigue, dizziness, or extreme hunger may indicate that you need to adjust your schedule or eat more during meals.

With the right guidance from the Best Nutrition and Dietetics Hospital in Bangalore, intermittent fasting can become a sustainable and healthy part of your lifestyle.

When to See a Nutritionist?

You should see a nutritionist if:

  • You’re considering intermittent fasting but have underlying health conditions.
  • You want a personalized fasting and nutrition plan.
  • You’re experiencing side effects like fatigue, mood swings, or nutrient deficiencies.
  • You’re not seeing results despite following a fasting schedule.

At Sparsh Hospitals, our team of dietitians and nutrition experts create tailored plans based on your health status, fitness goals, and lifestyle needs.

Conclusion

Intermittent fasting is a powerful, flexible tool for improving metabolic health, losing weight, and boosting energy levels. Whether you’re trying to manage insulin resistance, support brain health, or simply build a better relationship with food, intermittent fasting offers a research-backed strategy.

With support from the Best Nutritionist and Dietitian in Bangalore, you can explore the right fasting plan for your body and goals. Visit Sparsh Hospitals, recognized as the Best Nutrition and Dietetics Hospital in Bangalore, to begin your intermittent fasting journey with expert guidance and personalized care.

Frequently Asked Questions

What is Intermittent Fasting?

Intermittent fasting is an eating pattern where you alternate between periods of eating and fasting. It focuses on when you eat, not what you eat, and helps improve metabolic health and promote fat loss.

How does Intermittent Fasting work?

Intermittent fasting works by allowing insulin levels to drop and the body to switch to burning fat for fuel. It enhances hormone function and supports cellular repair, leading to various health benefits.

What are the benefits of Intermittent Fasting?

Key intermittent fasting benefits include weight loss, improved insulin sensitivity, better heart and brain health, hormone balance, and reduced inflammation.


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