The aroma of the food, colour and display of the food affects the quantity of how much food we eat.
Sense of smell is related with sense of taste. When you can't smell, the food may taste bland. We may even lose interest to eat food. We eat less when we are not keeping well . Aromas, may be used as a means of portion control. Food aroma affects bite size.
Satiety, comes from the aroma and taste of the food. They can manipulate the brain. They stimulate certain areas of the brain. Thus the feeling of fullness. This feeling is based on perception. It varies from person to person. The water, in our mouth is saliva. When we smell the food, more saliva is released. Our body is now getting ready to taste the yummy food. The Saliva begins the chemical breakdown of food.
Research shows that strong aroma, leads to smaller bit size. Smaller bite sizes are linked towards lower flavour release. We take smaller bites of foods if we are not familiar about them. This also results in weight loss. Smell is an integral part of the flavours. Sensation of food, depends on activation of cells at the end of your nasal passage. The information gathered by these cells, is released to mouth than. This process is called Olfactory referral.
Try closing your nose by holding a chocolate and feel the difference after letting it go. The flavour of Strawberry, can cause something perceived as sweet.