Why did nouvelle cuisine reject rich sauces?

Nouvelle cuisine rejected rich sauces primarily as a reaction against the calorie-laden extravagances of traditional French grande cuisine. By the 1960s and 1970s, practitioners of this new style sought to emphasize the natural flavors, textures, and colors of ingredients rather than masking them with heavy preparations.12

The movement was driven by several key motivations:

• Health and Dietetics: Chefs cited the unhealthiness of diets heavy in fats, sugars, refined starches, and salt, leading to a conscious effort to minimize these ingredients. One of the movement's "Ten Commandments" explicitly stated, "Thou shalt not ignore dietetics".13
• Culinary Philosophy: Proponents sought to replace the traditional, regimented system of thickening sauces with lighter alternatives, such as reductions of stocks and cooking liquids.4
• Creative Liberty: Younger chefs felt constrained by the rigid rules of the past and viewed the abandonment of heavy, traditional sauces as a way to simplify their cooking and allow for greater artistic invention.34

Ultimately, this shift reflected a broader desire to prioritize freshness and clarity of flavor over the heavy, structured traditions that had dominated French gastronomy for decades.14