Her much-hyped interview on Good Morning America teased that she had a "big announcement", leading many to speculate about the possibility of a new album, tour, or a second pregnancy.
However, the singer - who was recently eating burgers in the video for Feeling Myself with Nicki Minaj - went on to extol the virtues of a vegan diet.
Veganism involves a largely plant-based diet, excluding meat, eggs, dairy and other animal products.
"I'm not naturally the thinnest woman. I have curves," Beyoncé said. "I have struggled since a young age with diets. Finding something that actually works and keeps the weight off has been difficult for me."