girlygirl11

1600 calories is a losing weight level, expecially since you both are working out a lot. For both heights, you are extremely underweight. This can harm your body in many ways- for ex. women could stop menstruating (if you already havent), which could lead to osteoporosis and fertility problems. I'm not sure about the effects for men, but I would guess that the fertility would be an issue too, as well as MANY others.

In order to be healthy, both of you would have to gain some weight. Start by eating AT LEAST 2500 CALORIES PER DAY (especially if you continue with workouts). If your husband is eating 1600 calories/day, he cannot be "eating anything he wants" as you say. 3000 Calories would be ideal, but I would calculate it using a BMR Calculator, and then adding more calories because of the excersise (this step is important!). I would also cut back on workouts (if not eliminate all strenous ones) . At such an low weight, you are really only straining your heart, which could lead to heart failure as this progresses.

Fill you meals with high calorie foods if you find you can't eat a lot (in size). Drink nutritional supplements instead of juices or things like that. Eat nuts and add then to whatever you can. Buy hearty breads (usually have some sort of nuts/seeds in them) and use those often. Eat 5-6 meals/snacks per day, even if youre not that hungry. You'll need to train your metabolism (which right now is really really slow) how to handle more food, and doing it regularly (like clockwork) is really ideal.