* may not wear Tefilin on the first day of mourning &
* he may not eat of his own food , others need to bring food.
What is the connection ?
Perhaps it is due to the concept - if there is no Torah , there is no food.
Since he may not wear Tefilin the crown which also represents Torah & he may not study regular Torah , thus he is also limited in using his own food.
Now may be a good time for a gem of Torah study.