Maintain good health and keep your diet balanced when you are on a travel. Having a time constraint should not be a reason for you to skip your meals or miss eating healthy food. When your travel allows you to go back home at the end of day, you can carry with you a packed meal that you prepare yourself. You can buy fruits and salad ingredients a day before, prepare them at night, refrigerate them and then pack them before leaving.
If your travel requires you to stay somewhere else, you can express your food specifications to a hotel management. Inquire about their menus and if they can cook food that are not on their list. You can also request for fruits to come along with the meals. Most often than not they will be glad to serve you better.