So, I have a period and menstruate and I eat according to my cycle.
Week 1: Lamb or Chicken Liver and some root veggies Week 2: Fish or Chicken and some green veggies Week 3: Blueberries, Avocado, Tomato, Cheese and fish or smoked fish. A lot of berry type fruit. Week 4: Soup
Breakfast is always either: parfait, eggs, or oatmeal with an optional side of fruit. Dinner is lunch leftovers or beans (from a can), raw veggies in ranch, or pasta with olive oil and black pepper. Desert is a spoonful of almond butter, honey, or cheese.
I buy the ingredients accordingly and then whatever inspires me I'll make. Example: Week 1: Chicken liver over pasta. Chicken liver patte. Chicken liver with a side of veggies. Lamb shawarma in pita with some veggies. Lamb kimchi hotpot (korean style). Lamb with veggie sides. Week 2. Rotisserie chicken with spinach. Chicken spinach pasta. Chicken salad with onion. Salmon with asparagus and potatoes. x2 Week 3. Avocado tuna sandwich. Tuna/egg burgers. Tuna salad. Guacamole. Pico de gallo taco. (might have some left over chicken still). Week 4: Chicken soup. Mushroom soup. Ramen soup. Porridge.
I might get inspiration from seasonal foods (lamb is winter for example, and some fruits are more summery). I might also get inspiration from holiday fare. But generally that's the way it goes.
How did I come up with this? I just paid attention to what deficiencies arise on the week of my cycle (ex; post menstruation I'm low on B12/iron so I replenish the week after because if I eat B12 during, it causes cramps). And I eat Berries the week before to up my magnesium intake and reduce inflamation. And the week of I have soup because it's a healthy easy to digest comfort food.
P.S. Everyone's gut biome is different though- some people need to have iron on their period. I don't because my period only lasts 2.5 days and it's light.