Each and Every Type of Food that You Consume takes different amount of time to digest.

Nuts Like Almonds and pistachio: 3'Hrs

Beef: 3'Hrs to 4'Hrs

Chicken: 2'Hrs to 3'Hrs

Fish: 1'Hr to 1.5'Hrs

Potato or Starch Based Foods: 1.5'Hrs to 2'Hrs

Raw Vegitables: 0.5'Hrs to 1'Hrs

Cooked Veggies: 1'Hr

Milk or Lactose Products: 2'Hrs

Fruits: 0.25'Hrs to 0.5'Hrs

Water: Absolute Value that was invented by Aryabhata (And you Should take plenty)

So Before you decide to take another meal, you should know how much time you should allocate to get it digest to restrict yourself to become fatty or Obese.