![\"LookinBody](\"https:\/\/www.inbody.in\/blog\/wp-content\/uploads\/2026\/08\/lookinbody-software-dashboard.jpg\")
What Multi-Day Fasting Actually Does Inside Your Body<\/h2>\n
The body’s fuel-switching sequence during fasting is well mapped. Liver glycogen \u2014 the fast-access reserve your body taps first \u2014 is essentially depleted within 24 to 36 hours of reduced food intake. Muscle glycogen is more stubborn: research on extended fasting shows it drops by only around 20\u201330% after three full days without adequate carbohydrate intake. Once liver glycogen runs low, the body needs another source of glucose, and it turns increasingly to protein breakdown to fuel gluconeogenesis \u2014 the process of manufacturing glucose from non-carbohydrate sources, muscle tissue among them.<\/p>\n
How much of that protein comes from your own muscle depends heavily on what you’re eating and doing during the fast. At the extreme end, a controlled study of complete seven-day fasting (zero caloric intake) found that participants lost an average of 4.6kg of lean mass against just 1.4kg of fat mass over the week \u2014 even though their maximal strength stayed largely intact, because muscle tissue can shrink measurably before strength output actually drops. That’s the trap: you can lose real muscle mass and still lift the same weight or climb the same stairs for a while, which is exactly why the loss goes unnoticed until it’s already happened.<\/p>\n
Almost nobody in India does a true seven-day zero-calorie fast for religious observance \u2014 even the strictest Navratri vrat typically involves some fruit, milk, or water. But the same mechanism operates on a smaller scale whenever intake is reduced and protein specifically is scarce, which is precisely the profile of a typical Indian festival-fasting diet.<\/p>\n
Ramadan gives us the largest, best-studied real-world data on this, since roughly a fifth of the world’s Muslims fast for a full month every year. A systematic review and meta-analysis pooling data from 90 comparison groups and nearly 3,000 participants found Ramadan fasting produced an average weight loss of about 1.24kg over the month (1.51kg in men, 0.92kg in women) \u2014 and that the accompanying loss in fat-free mass (which includes muscle) was significant, running only around 30% smaller than the loss in fat mass. For roughly every 3kg lost as fat, close to 2kg came from lean tissue. Encouragingly, body composition tends to drift back toward baseline within 2\u20135 weeks after Ramadan ends, provided normal eating and activity resume. The real risk isn’t any single festival \u2014 it’s Navratri, Ekadashi, and other fasts recurring multiple times a year without ever correcting the protein gap.<\/p>\n
India Fasts More Than Almost Any Country in the World<\/h2>\n
Religious and festival fasting isn’t a niche practice here \u2014 it’s mainstream. Navratri is observed twice a year (Chaitra and Sharad Navratri), each a 9-day fasting cycle for millions of devotees across most Indian states. Ekadashi falls twice every lunar month, observed by a large population of Hindus nationwide \u2014 some households are fasting, in some form, roughly 24 times a year. Ramadan is observed with near-universal consistency: a 2023 industry survey found 99% of Muslims in India fast during the month, out of a population of roughly 200 million.<\/p>\n
Layer these together and India likely has more fasting days, across more of its population, than almost any other country. A single festival’s worth of lean-tissue loss might be trivial on its own \u2014 but repeated several times a year, for decades, on top of the age-related muscle decline every adult already faces after their mid-30s, the arithmetic stops looking trivial.<\/p>\n The issue isn’t fasting itself \u2014 it’s what’s on the fasting plate. Traditional Navratri vrat food deliberately excludes regular grains, cereals, and pulses for religious reasons, replacing them with a specific set of permitted ingredients: sabudana (tapioca pearls), kuttu atta (buckwheat flour), singhara atta (water chestnut flour), potatoes, fruit, and dairy. Several of these are excellent sources of quick energy. Almost none of them are meaningful protein sources on their own.<\/p>\n Look at that table and the pattern is obvious: sabudana khichdi, singhara halwa, and fried potato preparations \u2014 the default Navratri meals in most homes \u2014 are carbohydrate-dense and protein-poor. Meanwhile the two best protein sources already permitted during the fast, peanuts and paneer, are frequently used as garnish rather than the centrepiece of the meal. The fast isn’t the problem. The composition of the fasting plate is.<\/p>\n This is the crux of the body composition argument. A bathroom scale \u2014 or a BMI calculation \u2014 measures total mass. It cannot distinguish a kilo of fat from a kilo of muscle from a kilo of water. During restricted eating, all three shift at once, and not always in the direction you’d assume:<\/p>\n A body composition scan resolves this directly. An InBody assessment separates Skeletal Muscle Mass (SMM), Percent Body Fat (PBF), and body water distribution (via the ECW\/TBW ratio) into distinct numbers instead of one blended figure. Scanned before Navratri begins and again after it ends, the comparison shows immediately whether the 9 days moved fat, muscle, or mostly water \u2014 information no scale, tape measure, or mirror check can give you.<\/p>\n None of this is an argument against fasting. It’s an argument for fasting deliberately. The following adjustments work within the traditional rules of vrat and phalahar food \u2014 nothing here requires eating outside what’s permitted.<\/p>\n Paneer delivers roughly 18\u201320g of protein per 100g and peanuts around 25.8g per 100g \u2014 both comfortably permitted during Navratri fasting. A vrat meal built around a generous portion of paneer, or sabudana khichdi loaded with extra peanuts rather than a token handful, closes most of the protein gap without breaking any dietary rule.<\/p>\n Among permitted fasting flours, kuttu atta stands out with roughly 13.3g of protein per 100g \u2014 meaningfully higher than sabudana or singhara atta. Roasted makhana, at close to 9.7g per 100g, is a far better snack during a fast than fried potato chips, which offer calories and little else.<\/p>\n Milk, curd, and paneer are permitted through most Navratri and Ekadashi traditions and are the most reliable protein anchors available. Plain curd is only around 3.5g of protein per 100g, so it needs real volume \u2014 a small katori isn’t doing much; a full bowl, or curd blended into a lassi with nuts, moves the needle further.<\/p>\n Muscle protein synthesis needs a signal to hold onto tissue, not just fuel. You don’t need a heavy gym session on an empty stomach \u2014 even light resistance work during a Navratri fast, or in the hours after Iftar during Ramadan, gives the body a reason to preserve muscle rather than treat it as spare fuel.<\/p>\n For Ramadan’s structure, the two meals that matter are Suhoor (pre-dawn) and Iftar (after sunset). Anchoring both with a real protein source \u2014 eggs, dairy, legumes, meat or fish where eaten \u2014 rather than starting Iftar purely with fried snacks and sugary drinks gives the body amino acids to work with across the full cycle, not just carbohydrates.<\/p>\n Ramadan’s daytime water restriction is a different physiological load than Navratri’s food restriction, and dehydration itself can distort both performance and scale readings. Rehydrating steadily after sunset \u2014 rather than in one large burst \u2014 supports nutrient absorption and reduces the water-weight swings that make it harder to judge what a fast is actually doing to your body.<\/p>\n It can, particularly if the fast runs multiple days with low protein intake. Once liver glycogen depletes (within 24\u201336 hours) the body increasingly draws on protein \u2014 including muscle tissue \u2014 to fuel gluconeogenesis. Whether this happens to a meaningful degree during your specific fast depends heavily on how much protein-rich food (paneer, curd, peanuts, kuttu) you’re eating during the permitted meals.<\/p>\n<\/div>\n Sabudana itself is low in both fat and protein, so a plate of plain sabudana khichdi offers fast energy but almost no muscle-preserving nutrition. It isn’t “bad,” but it shouldn’t be the only source of calories during a multi-day fast. Adding a generous quantity of peanuts (roughly 25.8g protein per 100g) to the same dish meaningfully improves its protein content without breaking fasting rules.<\/p>\n<\/div>\n Yes, and it’s one of the more effective things you can do to protect muscle during a fast. Light-to-moderate resistance work signals the body to preserve muscle tissue rather than break it down for fuel. For Navratri, train in whichever window your energy is highest. For Ramadan, most people find light training in the hours after Iftar, once some food and fluids are on board, more sustainable than training during the fasting window itself.<\/p>\n<\/div>\n A meta-analysis pooling data from nearly 3,000 participants found that Ramadan fasting produces an average weight loss of about 1.24kg over the month, and that the accompanying loss in fat-free mass (which includes muscle) was statistically significant \u2014 running only around 30% smaller than the loss in fat mass. The same research shows body composition typically drifts back toward baseline within 2\u20135 weeks after Ramadan ends, provided normal eating and activity resume.<\/p>\n<\/div>\n ICMR-NIN’s 2020 dietary guidelines set the RDA for healthy Indian adults at 0.83g of protein per kg of body weight per day, rising to around 1g\/kg for people on predominantly cereal-based (lower-quality protein) diets \u2014 which describes most traditional fasting menus. For a 60kg adult, that’s roughly 50\u201360g of protein per day even during a fast, ideally split across whichever meals the fast permits.<\/p>\n<\/div>\n Scale weight during any fast reflects a mix of glycogen-bound water loss (each gram of glycogen is stored with roughly 3 grams of water), genuine fat loss, and \u2014 if protein intake was low \u2014 some muscle loss. These can offset each other on the scale even when real, meaningful changes are happening inside your body. A body composition scan is the only way to see which of the three actually moved.<\/p>\n<\/div>\n Yes. An InBody assessment separates Skeletal Muscle Mass, Percent Body Fat, and body water distribution into distinct readings rather than one blended number. Scanned before and after a fasting period like Navratri or Ramadan, it shows precisely whether the change on your scale came from fat, muscle, or water \u2014 something no bathroom scale or BMI calculation can tell you.<\/p>\n<\/div>\n![\"InBody](\"https:\/\/www.inbody.in\/blog\/wp-content\/uploads\/2026\/08\/inbody-dial-h20-app.jpg\")
The Navratri Plate Problem: Heavy on Carbs, Light on Protein<\/h2>\n
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\n \nFasting-friendly food<\/th>\n Protein per 100g<\/th>\n What it’s good for<\/th>\n<\/tr>\n<\/thead>\n \n Sabudana (tapioca pearls)<\/td>\n Negligible<\/td>\n Fast carbohydrate energy; low in both fat and protein<\/td>\n<\/tr>\n \n Singhara atta (water chestnut flour)<\/td>\n Low<\/td>\n Carbohydrate energy, fibre, potassium \u2014 not a protein source<\/td>\n<\/tr>\n \n Kuttu atta (buckwheat flour)<\/td>\n ~13.3g<\/td>\n The one fasting flour with real protein content<\/td>\n<\/tr>\n \n Makhana (fox nuts)<\/td>\n ~9.7g<\/td>\n High-volume, low-fat snacking protein<\/td>\n<\/tr>\n \n Roasted peanuts<\/td>\n ~25.8g<\/td>\n The highest-protein ingredient already in your fasting kitchen<\/td>\n<\/tr>\n \n Paneer<\/td>\n ~18\u201320g<\/td>\n The single best protein anchor for a vrat meal<\/td>\n<\/tr>\n \n Plain curd (dahi)<\/td>\n ~3.5g<\/td>\n Complete protein, but low in density \u2014 needs volume<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Why the Scale Can’t Tell You What You Actually Lost<\/h2>\n
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How to Fast for Navratri, Ekadashi, or Ramadan Without Losing Muscle<\/h2>\n
1. Make paneer and peanuts the centre of the plate, not the garnish<\/h3>\n
2. Use kuttu and makhana as your protein-bearing carbs<\/h3>\n
3. Don’t let dairy be an afterthought<\/h3>\n
4. Keep some resistance stimulus during the fasting period<\/h3>\n
5. Time your protein around when you can actually eat<\/h3>\n
6. Watch hydration, especially where water is also restricted<\/h3>\n
Frequently Asked Questions<\/h2>\n
Does fasting during Navratri actually cause muscle loss?<\/h3>\n
Is sabudana khichdi bad for muscle preservation while fasting?<\/h3>\n
Can I do resistance training while fasting for Navratri or Ramadan?<\/h3>\n
Does Ramadan fasting cause muscle loss, according to research?<\/h3>\n
How much protein should I eat during a multi-day religious fast?<\/h3>\n
Why didn’t my weight change much during Navratri if I’m eating so much less?<\/h3>\n
Will a body composition test show if I lost muscle during a fast?<\/h3>\n