Meals wanting is a powerful desire or attraction to eat a specific meals. It is different from normal appetite or flavor. Cravings usually include sweets and chocolate, delicacy-like sweet foods, sometimes salty or unhealthy fats.
An disproportion of bodily hormones like leptin and serotonin is responsible for craving for food. But stress is the greatest reason for craving for food. Stress produces many of the hormonal cortisol, which raises desires for greasy and salty foods as well as sweet food items. 
This hormonal also increases appetite or appetite. Many people feel relieved after eating once again, so they always keep consuming again and again.
Without having consuming in an adequate and balanced way, blood sugar varies, sometimes dropping to a level that causes sugar or sugars desires.
It can be more if diabetic patients do not eat regularly. If they don't choose a balanced diet, they may lack protein, fat, B vitamins or other nutrients, for dieters. In that case meals craving happens.
Hormonal changes result in desires for certain food items during pregnancy.
Things to be performed
According to height and weight should be from balanced diet adequate calorie intake. Don't by pass any nutrients.
Do not go without having meals for a long period. Don't hold off until you're extra hungry. Fasting triggers blood sugar levels to cravings and drop for sugary foods to improve.
Hunger and thirst are carefully associated. Drink a window of water and wait around twenty minutes, so the thirst goes away.
Be relaxed. Ensure sufficient rest during the night.
Rather than processed foods like soft drinks, frozen treats, cakes, candies etc. select healthy food with higher dietary fiber carbs like fruits, vegetables, nuts and raisins, oats etc. Try filling up on proteins witheggs and milk, poultry or pulses.
Food cravings usually go away in 20 minutes or so. During this time you can do something interesting to take your mind away meals. For example, read a book or pay attention to songs.
Every one should be concern about obesity, over weight will harmful for health as well as work productivity.
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Also regular exercise and diet important to maintain weight loss process.
