There are days when, despite wanting to eat everything fresh, you are left with heaps of leftover foods, while most people discard leftover food, but when it comes to Indian households. Throwing away food is a simple no! However, even in the books of Ayurveda, eating food within three hours of cooking is essential for good metabolic health. However, this narrative has changed in the past few years, and experts are now vouching for eating leftover roti and rice, as they are believed to have more nutritional value after the natural fermentation process. Here’s all you need to know…Nutritional change through fermentationIt is believed that the leftover cooked rice and roti to age or ferment overnight increases resistant starch, improves digestibility, and boosts nutrient bioavailability, making them potentially healthier than their fresh counterparts. Fermentation of baasi rice and roti triggers microbial activity, primarily from lactic acid bacteria and yeast, which break down complex carbohydrates into simpler, more digestible forms. This process reduces starch content and increases resistant starch, a type of fiber that resists digestion in the small intestine and feeds beneficial gut bacteria in the colon. Studies show fermented rice drink contains 19.73 g of resistant starch per 200 mL, compared to just 5.33 g in unfermented rice, significantly enhancing its prebiotic potential.Enhanced digestion and gut healthThe process of fermentation uses enzymes that make the texture of baasi roti and rice softer so they are easier to digest. Lactic acid bacteria create glycoside hydrolase, which changes hard to digest polysaccharides into sugars making it easier on the stomach. Fermented rice also has dietary fiber increasing from 0.3 grams to 2.46 grams in 100 grams, which helps with regular movement of the bowels and reduces constipation. This fiber and resistant starch together slow down how fast sugar is absorbed, which helps with gut health and less bloating.Improved nutrient absorptionFermentation helps the body take in important minerals like iron, zinc and calcium by lowering harmful substances like phytates that stop the body from absorbing them. Research shows that iron content goes up after fermentation with one study showing iron levels in rice soaked for 12 hours. Also zinc levels in fermented basi samples went up from 0.62 mg per 100 g to 1.04 mg per 100 g. B- vitamins, vitamin K and needed amino acids also go up which helps the body work better and the immune system stay strong.Blood sugar and weight managementOld roti and rice have a lower glycemic index because they have more resistant starch, which makes sugar go into the blood more slowly. A study found that chapati kept at 4°C reduced blood sugar levels in rats from 291.0 mg per 100 mL to 225.2 mg per 100 mL over 28 days which’s better than fresh chapati. This makes baasi foods good for people with diabetes. Also resistant starch works like fiber, which helps people feel full and eat less which helps with managing weight.What studies sayA 2023 study showed that chapati kept at 4°C (T3) had resistant starch and a lower glycemic index, which made it better for controlling blood sugar than freshly made chapati. Another study on fermented rice drink found higher levels of protein (from 1.94 grams to 2.4 grams in 200 mL) dietary fiber (from 2.6 grams to 19 grams) and important nutrients like zinc, selenium and B-vitamins after being fermented. These results confirm that the aging process turns foods into foods that are full of nutrients and good for health.Cooling effectIn Indian ways baasi roti soaked in cold milk or water is eaten during summer because it helps cool the body. This practice helps control body temperature and stops problems from heat. The water from soaking along with keeping the nutrients helps the body feel better during weather making it a good food for the season.What’s the right way to consumeBaasi foods are safe if they are kept in tight containers at room temperature or in the fridge within 12 to 15 hours. Signs that they are bad—like a smell, mold, or a strange texture—mean they have bad germs and should be thrown away. People who have problems with histamine or kidney disease should not eat fermented foods because they have levels of histamine and potassium. When eaten the way baasi roti and rice are, it is a good way to use less food and stay healthy.