During Chol Ha'moed, more food than usual is available. The relevant science suggests that, when there's a lot of food variety available in our homes, we're more likely to overeat. Still, food logging may slightly lessen the likelihood of this overeating.
Imagine that you're neither overweight nor underweight, but at an average weight. Still, you'd like to lose another ten pounds or so.
Electronically counting calories requires multiple steps:
Weighing all the food you eat for a meal. (E.g. 200 grams of "chulent" stew, 150 grams of "challah" bread, and 500 grams of vegetable salad.) I use a digital food scale.
Entering this food (stew, bread, and salad) into a free calorie-counting app. I like the Nutritionix app, which has a more-accurate food database than many of its competitors. But some people prefer MyFitnessPal or one of the numerous other options out there.
Once you've done these steps, the app will calculate the total calories for the meal and add them to your daily total.
Is it permissible to do the above steps during Ḥol Ha'moed?
When you answer, please explain your reasoning. Thanks in advance!
Caloric restriction isn't especially pleasant. Most of my weight loss has been from modified fasting with fluid and electrolyte supplementation; unfortunately, you may not find that fasting brings you any Chol Ha'moed joy.