Intermittent Fasting vs Vedic Fasting

KaustubhaReflections

Jun 17—2025

It began with Chinni, of course. She was hovering near the kitchen as I rinsed methi leaves for our Sunday dal.
“Maasi,” she asked, scrunching her nose, “why do you skip lunch on Ekadashi but say ‘fasting is bad for blood sugar’ the rest of the week?”

Her tone was innocent, but the question sliced straight through the butter of my morning calm.

I looked at her—ten years old, knees scraped from yesterday’s cricket game, holding a spoon like a microphone. The kind of question only a child could ask—and only a PhD-wielding, tradition-straddling maasi like me could feel cornered by.

So I did what I always do when cornered: I reached for both memory and science.

A Tradition Older Than the Clock

Fasting is not new. But in the last decade, it’s worn some very modern clothes. The Silicon Valley variety—intermittent fasting (IF), with its clean apps, digital timers, and hormone-optimization hashtags—sells itself as a hack for everything from belly fat to brain fog.

But in India, the act of choosing not to eat at certain times isn’t a trend. It’s a rhythm. A ritual. A coded cultural script passed down not by influencers but by grandmothers who never counted calories and yet knew exactly when to stop cooking rice for the day.

Take Ekadashi, the 11th day of the lunar cycle—when many Hindus observe a water-only or grain-free fast. Or Karva Chauth, where married women fast for the long life of their husbands. Or Ram Navami, where many abstain from salt. These fasts weren’t arbitrary—they were encoded into calendars tied to nature, planetary motion, and digestion cycles that modern science is only beginning to understand.

The Modern Intermittent Fasting Model

Let’s lay it out: Intermittent fasting (IF) typically involves cycling between eating and fasting windows—say, 16:8 (fasting for 16 hours, eating within an 8-hour window). The benefits, as shown by research, are compelling:

Improved insulin sensitivity
Enhanced autophagy (cellular cleanup)
Reduced inflammation
Support for weight loss and metabolic health

According to a 2020 review in the New England Journal of Medicine, intermittent fasting can trigger metabolic switching—from glucose to fat as a fuel source—offering benefits for brain and body alike.

Fasting apps saw a 400% surge during the COVID-19 pandemic, according to a 2021 global health tech report. But somewhere between the trend and the truth, something got lost.

A neighbor once told me she skipped dinner all week because her app said 16:8. By Friday, her hair was falling out and she couldn’t remember her ATM pin.

So what’s the problem?

What IF Forgot: Rhythm, Intention, and Satva

The modern fasting protocol treats the body like a machine that needs optimal fuel cycles.

The Vedic tradition treated the body like a temple that needs alignment with time, season, and spirit.

Where IF counts hours, Vedic fasting aligns with lunar phases. Where IF is rigid, tradition is cyclical. Where IF often centers aesthetics or efficiency, traditional fasting invited introspection, community, and clarity.

In Ayurveda, the goal of fasting (upavasa) isn’t weight loss—it’s sattva: clarity, purity, lightness of being. It’s a way to restore digestive fire (agni) and reduce accumulated toxins (ama).

And here’s the kicker: Ayurvedic texts like the Charaka Samhita didn’t advocate daily or chronic fasting. They warned against it. Instead, they prescribed short, seasonal, intention-based fasts—adjusted for dosha (body constitution), climate, and age.

Timing Isn’t Just the Clock—It’s the Cosmos

Mr. Raghavan, my favorite spice vendor, once told me, “The body listens to the moon even if the mind doesn’t.” He was trying to explain why his grandmother only fasted on full moon nights and never during eclipses.

As strange as that sounded to my clinical ears, there’s growing evidence that circadian rhythms—and even infradian ones tied to lunar cycles—affect metabolism and hormone secretion.

Modern science talks about chrononutrition—the study of how food timing impacts health. But our ancestors were already practicing it:

Fasting before the monsoons to counter microbial overgrowth
Eating light during summer fasts to cool pitta
Consuming warm, unctuous foods post-fast to rekindle vata

These weren’t random—they were seasonal safeguards, woven into festivals and rituals.

What You Break a Fast With, Matters

One of the biggest omissions in IF culture? Re-feeding wisdom.

When I see people break a 16-hour fast with black coffee and protein powder, my inner Ayurvedic grandmother cries a little.

In our home, breaking a fast was almost a sacred act. Warm, gently spiced moong dal. Steamed red rice with ghee. Maybe a banana softened in cardamom milk. Foods that soothed the gut, not shocked it.

Modern research now shows that post-fast meals significantly impact the body’s inflammation response, glucose spike, and gut microbiome. The Vedic system already knew that.

You don’t just end a fast. You land it gently.

Fasting Was Never Meant to Be Solo

Unlike the often solitary IF ritual—timed alone, often in pursuit of individual goals—Vedic fasting was communal.

You knew Ekadashi was approaching not because of your app, but because your neighbor stopped buying onions. Your aunt soaked sabudana. Your colony temple announced prayers.

Fasting came with stories, songs, laughter, and rules. Maya, my skeptic-in-chief best friend, once asked, “But wasn’t that all superstition?”

Maybe. But maybe it was also psychosocial support. Maybe communal fasting reduced stress, offered belonging, and turned discipline into celebration.

A 2017 study in Psychoneuroendocrinology found that communal rituals—even when not overtly religious—can lower cortisol levels, boost oxytocin, and improve health outcomes.

Turns out, maybe your grandmother’s shared fasts were better for your heart than just your waistline.

So… Fast or Not to Fast?

That’s not the right question.

The right one is: Why? When? How? And with what intention?

If you fast because an app tells you to, but ignore your body’s cry for nourishment, is that health—or is it another form of disconnection?

If you fast in winter the same way you do in summer, are you honoring rhythm—or resisting it?

And if you fast alone, secretly, hungrily—and break it with a sense of guilt or excess—are you healing… or hurting?

Asha’s Gentle Reflections (And Chinni’s Final Word)

I told Chinni, later that day, that I don’t fast on Ekadashi out of punishment or pressure. I do it because it feels like my inner slate gets wiped clean. Because it slows me down. Because somewhere between the hunger and the hot dal that follows, I remember what it feels like to be grateful.

She looked unimpressed and said, “Can I fast too?”

I laughed. “Only if you promise to eat slowly, with both hands, and tell me what each bite tastes like.”

She grinned. “Deal.”

And in that moment, I saw not a child mimicking a trend—but a girl reaching back through time, toward a rhythm her body hadn’t forgotten.

Your Turn

Have you ever fasted in rhythm with the moon, or your grandmother’s calendar? What did your body remember that science hasn’t caught up to yet?

Let’s talk—not just about when we eat, but why.

We’d love to hear your thoughts. Let’s chat below!Cancel reply

Home