Here is a list of allowed foodstuff -
What kind of food products can I bring to the U.S.?
Food, Plant, and Animal Products
General List of Approved Products
This list covers products from all areas except Canada, Mexico, Hawaii, Puerto Rico, and the U.S. Virgin Islands.
Bamboo - dried poles only
Beads made of seeds - (but not jequirity beans)
Breads, cakes, cookies, and other bakery goods
Candies, confectionery, chocolates
Cheeses - fully cured hard cheese only
Coconuts - (but husks or milk must be removed)
Coffee - roasted beans only
Dried foods - including polished rice, beans, and tea
Fish
Flower bulbs - (but not crocosomia, gladiolus, and watsonia bulbs from Africa, Argentina, Brazil, France, Italy, Malta, Mauritius, Portugal or Uruguay)
Flowers - most fresh or dried kinds (but not with roots), except eucalyptus
Fruits - canned or dried products only
Herbarium plants - (but not witchweed)
Herbs - dried, for medicinal use
Mushrooms
Nuts - (but not chestnuts or acorns or nuts with outer husks)
Sauces - canned or processed
Seaweed
Seeds - (but not avocado, bamboo, barberry, coconuts, corn, cotton, currant, elm, hibiscus, lentil, mahonia, mango, pearl millet, potato, rice, sorghum, and wheat)
Shamrocks - without root or soil
Soup and soup mixes - (but not those containing meat)
Spices - dried (but not curry leaves)
Straw animals, hats, baskets, and other souvenirs - (but not items stuffed with straw)
Vegetables - canned or processed
from the
US Embassy
Marmite is most certainly ok we always take some with us

Hope this helps.
Claire
