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Watch for cross contamination at home and at restaurants. Be sure that allergenic foods are prepared away from your foods- for serious allergies, you should go as far as using different utensils, knives, cutting boards, pans, etc. Watch out for fried foods! Even if they are safe, they are often fried in the same oil as non-safe foods.
Check your supplements (vitamins, etc.) and enriched foods!! Even if they don't say on the label, call the manufacturer and ask. For example, Vitamin C is often derived from corn. Vitamin E (which is in most enriched packaged foods) is usually derived from soy. It will not say soy on the label, even if an ingredient is derived from it!!