Duly is defined as at the right time or as expected. An example of duly is a person showing up when they were supposed to arrive. in a due manner; specif., 1  as due; rightfully.  when due; at the right time.
If you eat a high-fat meal, you will feel tired after eating because fat is harder for the body to digest than carbohydrates and protein. When you eat a lot of fat, your digestive system becomes sluggish, and your body sends more blood to your digestive organs so that the job of digesting your food can be done.ood Allergies. A classic symptom of food allergies is feeling tired after eating a food you are allergic too. Common food allergies include gluten (the protein in wheat), dairy products and tree nuts, but sensitivity to any food can cause fatigue.
If you don't eat enough food, your body starts to shrink gradually. As you starve, your liver converts muscle to glucose to keep your brain alive. As you starve, your hunger pains disappear. After that, you're just tired. Once you burn through 70 to 94 percent of your body fat, and 20 percent of muscle, you die.