I suspect dehydration, beer and sausage but it's unpredictable. My uric acid is always high but attacks are usually a couple of years apart so I don't take meds. I once had an attack at the beginning of a week long bike tour. Pedaling was tolerable (lots of Alleve) but clipping in was excruciating. I left the shoe clipped to the pedal which was awkward because it was my "down" foot. I only toppled over once but did a lot of planning ahead for dismounts.