Nutrition: Small Appetite and Unintentional Weight Loss Download "Are You Losing Weight? (PDF)", (676 KB) Download English PDF (1 MB) Download Chinese PDF (1.1 MB) A small appetite occurs when you eat lesser due to ageing or being unwell. Unintentional weight loss occurs when you lose more than 3kg in a span of 3 to 6 months.Read on to find out how to identify if you have a small appetite and unitentional weight loss and what you should do. [Please download the PDF file if you are unable to view the image below.]