Mental load is a term that refers to the invisible work done to manage and oversee a household and family.
Known for his research on relationships, Dr. John Gottman discovered a "magic ratio" of positive to negative interactions in every relationship. Five or more expressions of appreciation for every negative interaction keep a relationship strong.
Since the mental load is unseen by others, the time, effort, and energy of managing this ongoing work goes unnoticed and unappreciated. This lack of gratitude can unbalance the "magic ratio," resulting in a build-up of resentment and frustration.