I'm running a marathon and am having a lot of trouble keeping weight on. any tips for healthy foods that keep my levels up? i weight between 120-125 and am nearly 5'9. i'm trying to maintain and not look like a skeleton!

You : You may need to increase your caloric intake, since your body is burning so many calories both during and after the runs. Opt for nutritious foods that are high in carbohydrates as your body needs the extra carbohydrates to burn for food. Also, try taking a protein supplement - there are some brands that are very high in calories and are meant to provide additional supplement to help gain weight. Eat small meals and snacks every 2-4 hours, this will help keep your metabolism healthy and effective. In addition, as you train for your marathon, make sure that you incorporate weight training into your exercise routine. This will help build muscle which, in term, will help maintain and gain weight.

nutritionist: Seek the help of a nutritionist and / or dietition. This way you get custom plan based on your specific needs. You may already have a high metabolic rate. You must consume more calories than you burn to gain, equal to maintain. The type (protein/carb/fat) is also a factor. Weight training will also help maintain muscle mass. Good luck.