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Foods particularly rich in L-Leucine are beef (approx. 1690 mg / 100 g), raw salmon (approx. 1615 mg / 100 g), eggs (approx. 1090 mg / 100 g) and wheat products (approx. 920 mg / 100 g). L-Valine und L-Isoleucine are also included in significant amounts in meat and other animal produce. Dried peas (approx. 1160 mg / 100 g) and walnuts (approx. 750 mg / 100 g) are particularly suited for vegetarians with their high BCAA concentration. read the review.
Quinoa, spinach, sweet potatoes, beets, and wheat-based breads, crackers, breakfast cereals, and pasta appear to be much higher in betaine than other plant foods. See the USDA Database for the Choline Content of Common Foods, Release 2 (2008) for more details.