Iodides are in many of the foods we consume and iodides aggravate acne.  An iodide rich food on it’s own may not be too much of a problem but when combined with other iodide rich foods it can be too much.  Some vegetables naturally have iodides.  You also need to take into consideration the soil they were grown in.  Foods grown in California and Florida soils will have higher levels of iodide than those grown in Midwestern soils. 

Vegetables containing iodides: 

Asparagus*
Broccoli
Brussel sprouts
Carrots
Corn
Green beans
Idaho potatoes
Okra
Peas
Spinach
Tomatoes
White onion* 

Some other items containing iodides: