diet info!

If you are both trying to keep your diet healthy and eating the right amounts of fruits, vegetables and lean meats. I think one of the biggest things you may be missing that would take up a considerable portion of your calories and is essential to a healthy diet is your "good" fats... 20-30% of your daily calorie intake should come from fats (the ones that promote heart health, brain function, etc) with no more than 10% of those being from saturated fat.
If you are on a diet of 1400 calories a day, you should be getting 280-420 calories from fats a day (no more than 140 cal from saturated fat). While protein and carbs are 4 calories per gram, fat is 9 calories per gram. This means, for your 1400 calorie goal, you should be eating between 31-46 grams of fats a day (with no more than 15g of those being saturated fat).
Avoid Trans Fats (none of them are good for you...) but below are some suggestions on small snacks you could add that would put the essential fats into your diet, and won't make you feel "full" like the meals you've been trying to pack in.
Low fat cheese (1/4 cup added to a salad will add 80 calories and 4.5g of fat, 2 of which are sat)
Avocado's (1/2 an avocado is 144 cal and 13g of fat, 1 of which is sat)
Raw Whole Almonds (1/4 cup is 180 cal, 15g of fat, 1 of which is sat)
Hazelnuts (1oz, 183 cal, 17.7g fat, 1.3 of which is sat)
Pecans (1oz, 201cal, 21g fat, 1.8 of which is sat)
Spectrum Organic Flaxseed Oil (1tbsp, 130 cal, 14g fat, 1.5 of which is sat)
Walnuts (30grams, 200 cal, 20g fat, 2 of which is sat)
Atlantic Wild Salmon cooked over dry heat (6 oz, 310 cal, 13.8g fat, 2.2 of which is sat)
Natural Peanut Butter (2tbsp, 210 cal, 16g fat, 2.5 of which is sat)
Olive Oil (1tbsp, 120 cal, 14g fat, 2 of which is sat
As you can see, if you take a handful of nuts and add a tbsp of olive or flaxseed oil and throw them into your salad, or even just eat the nuts as a little snack, you will add an extra 200-300 calories to your daily intake and ensure you get the healthy fats you need.
If you want to read more about the good fats and what they do for your body, read this article: http://www.helpguide.org/life/healthy_diet_fa ts.htm it has some really good information about how to pick the right fats in your diet and why they are SO important.