Why should we not eat fruits with main meals?

Why avoid Fruits during Lunch/Dinner or post sunset? Avoid having fruits during the major meals (Lunch/dinner). Fruits are a source of sugar/energy. We mostly take carbohydrates during our lunch and dinner in the form of chapati/ veggies/ rice etc. These carbs are ultimately converted into sugar in the body, which is utilized for energy purpose. If we consume fruits as well, the excess sugar from fruits has higher chances of going into fat storage. Thus, it's best to avoid them during lunch/dinner. Here's the reason why we have to avoid fruits post sunset- Our activity levels tend to drop as the day ends. Fruits are a natural source of sugar. We need this sugar during the day when our activity levels are high, and this sugar gets utilized. After 6 or 7 pm, we have dinner already lined up plus we go low on activities, thus the extra sugar from fruits have high chances of going into fat storage. Fruits are always a good snacking option in the mid-morning or during the teatime.