Thanks for writing to HCM
For HIDA Scan patient should have at least 4 hour fasting. You may be allowed to take clear liquid only. Food in any form can't be taken as it causes contraction of Gall bladder
and it will not be seen in HIDA Scan. Gall bladder should be fully distended to visualized during scan. Drugs are given for contraction of GB after proper visualization.
Thick fatty layer around liver
means deposition fat around liver.
You should take fat restricted diet
and increase your physical activity.
You should also take proper amount of calories otherwise it will be deposited in the body.
You may also need medicines after assessing lipid profile
Get well soon.