They said i could possibly develop a nut allergy one day. why?

Risk of nut allergy: You can develop a nut allergy at any time in your life. Having a family history of allergy, or a personal history of other allergic disorders, such as eczema or hayfever may increase your risk of developing a food allergy. However, nut allergy can occur in individuals with no other allergic history. Eating large amounts of nuts or foods containing nuts is not a risk factor by itself.