Well, start by realizing that how you eat is an important determinant of how you feel and how healthy you are. But also realize that food is a major source of pleasure and focus of social interaction. Learn the basics of human nutrition and experiment with your own diet to see what works for you. By doing these things, you will set a good example for other people. Again, I think this is an individual matter.
Some people feel more energetic if they eat less protein and more complex carbohydrates.
Pay attention to intake of caffeine, which can disturb energy cycles. Make sure you get regular exercise and that the timing of your exercise suits you. Menopause can certainly bring changes in energy and middle age, in general, is often associated with a greater tendency to gain weight. At this time in life, it is especially important to get regular physical activity. Yes, I am afraid so and not only middle-aged adults, but young adults, too.