For me personally:

Energy drinks
MSG in large amounts
Stress
Too much sunlight
Any sort of snowstorm or rainstorm
Being tired
Currently Loving:
Shampoo: Giovanni 50:50

Conditioners - CJ Strengthening, CJ Beauticurls Argan and Olive Oil, CJ Rehab, CJ Curl Fix

Leave-in: CJ Smoothing

Deep Conditioner: CJ Hibiscus and Banana Deep Fix

Stylers - Tigi Curls Rock Amplifier, AG:Recoil, KCCC, Mop-C Curling Cream, Paul Mitchell Sculpting foam