Isn't it nice to know you're not alone! Welcome to the wonderful world of "I can't eat that"!! In addition to nut allergy I also have a dairy allergy and I'm gluten-intolerant so that means no wheat, rye, oats, or barley and I have to be careful with starches in general so easy on the legumes, potatoes, rice blah blah blah! Anyway, you can get sunflower seed butter and I found some rice flour tortillas (oh yeah, no yeast Period in my diet) and I'll make up fruit-sweetend jam and sunflower seed butter tortillas to carry, rice cakes with hummus or seed butter. Alecar (think Emergen-C) makes an electrolyte replacement drink that is everything free but the electrolytes your body needs, so I carry those with me on all my rides. I just carry all my own food - I can't always be sure whats in anything I buy or is provided and my allergies usually translate into asthma attacks (bad news on a bike 50 miles from home
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Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"