"As both a registered dietitian and chef, my favourite healthy, packable lunch is a lentil salad with vegetables, a can of tuna, and a basic oil and vinegar dressing," said Abbie Gellman, MS, RD, CDN, of Culinary Nutrition Cuisine. "I simply whisk olive oil, my favourite vinegar, Dijon, salt, and pepper together in a portable container, then add in lentils . . . and chopped raw veggies like pepper, carrot, cucumber, and celery," she said. She brings along a can of tuna packed in water and a sealed bag of baby greens, then mixes it all together for a tasty and healthy lunch. (PS: Abbie says canned lentils or beans work fine!)