Are you familiar with the work of Dr. John Matsen? I'm not sure what the weather is like around your area in the winter time, but eating tropical fruit (banana's, pineapple, etc. ) could disrupt your body's activation of vitamin D, as the body thinks it's summertime when we eat tropical fruit so it's apparently not healthy to eat tropical fruit all year round unless where you live is sunny all year long (our skin+sun activate vitamin d). It could disrupt your vitamin d levels which affect your calcium absorbtion. ALthough, 30 day trial won't make a diff I dont' think.
Also, will you be getting enough EFA's and fibre on this diet? Not the type of fibre found in fruit, but the second type.