@wolly Can I ask how long you've been eating 1600 calories/day?
Also, do you have a reason for eating 1600 calories vs another number of calories?
When I first started eating in a deficit, I was very hungry throughout the the day for a couple weeks. I used intermittent fasting to help me so I would have dedicated times of the day when I could eat.
I didn't stay at this deficit long as I was only trying to lose a couple pounds of fat before bulking muscle, but I would say after about 3 weeks I had completely adjusted to the deficit diet.
After the deficit, I upped my calories from around 1300/day to 1650/day (current; 5'2", 119) and found it difficult to eat that many more calories in a day.
I really think it's all an adjustment and making sure you are starting with the right number of calories for you.
Here is a good article to read that includes a calculator to determine your calories and macros
https://legionathletics.com/macronutrient-calculator/
Also, you aren't eating a lot of food for the calories you're consuming. Rice is super high cal and low in protein - trying switching out for quinoa or another seed. Nuts are also really high in calories without being filling.
Hope this helps