It might sound vague, but trust me it works. Drink plenty of water throughout the day as sometimes thirst gets confused with hunger which leads to unhealthy snacking. 

Do not eat anything and everything at the work desk. Eat mindfully and try to incorporate healthy snacks and meals into your diet. 

Do not forget to take short breaks and move your body to keep your muscles active. Do quick squats, lunges, or push-ups before returning to your desk. 

Do light stretches and desk exercises like leg lifts, seated leg extensions, or seated Yoga to keep your body moving and burn calories. 

Many desk dwellers rely on caffeinated drinks to stay alert and work. But it can backfire sometimes and be harmful to health. Try to limit sugary and caffeinated drinks. 

Homemade lunch is the best way to combat unhealthy eating at the desk. Try to pack a nutrition-dense meal to replenish your body to work efficiently and stay fit.