According to the web page http://www.weightloss.com.au/weight-loss-tools/food-diary.htm , DIARY IS SOME KIND OF NOTES THAT YOU TAKE TO DESCRIBE THE MATTER HAPPENED DURING A PERIOD. Be careful, and always make sure you are using the correct words in your pages!! Hope it'll help...
* Diary = a book in which you write down the things that happen to you each day. 
** Dairy = milk, butter, cheese etc. 
- > http://www.ldoceonline.com/dictionary/ <Longman Contemporary Dictionary