The most common factor that I can think of is that recipes are largely lifestyle-dependent. When there weren&rsquot many technological advancements, and we didn&rsquot have a lot of cooking equipment like the microwave oven, refrigerator, or mixer grinder, for that matter, a lot of techniques involved in cooking were different. These recipes needed finesse, care, and time. And this is not just restricted to our country it has been the case abroad as well. When people started having a paucity of time, they needed recipes that could be cooked easily and quickly. Hence, not carrying forward these traditional means of cooking and finding alternative recipes that could be cooked in a shorter span led to the diminishing of the culture and, later, the recipes getting lost.