How does amlodipine effect your appetite?

Both loss of appetite and increased appetite are rare reported side effects of amlodipine.
https://www.drugs.com/sfx/amlodipine-side-effects.html
Some side effects disappear with time as your body starts to adjust to the medication while others remain. You should speak with your doctor if this is an issue for you.
On another side amlodipine may cause fluid to build up in your body because it can make you urinate less. The buildup of fluid in your body can cause weight gain.