Osteoporosis. I have both calcium and vitamin D supplements to take as needed. I try not to need either on a daily basis. Fortunately I like milk - often a cup to a cup and a half in the morning for breakfast. I try for calcium rich food throughout the day. If I fall short, I take a supplement in the evening. I have a harder time with vitamin D.
Foods: I like and eat many of the ones (sardines 
) already mentioned. I buy bread that has 15% of daily calcium requirement per slice. So this morning I figure I managed about 40% of my daily calcium need with one piece of toast and o.j. fortified with calcium and vitamin D. Lunch - not so good though. And it’s a rainy day so no sunshine for me. Looks like I’ll need to take a supplement today.
Ways I add calcium whenever possible:
Bread (fortified with calcium)
Orange juice (fortified with calcium and vitamin D)
Lala yogurt smoothies (calcium and vitamin D)
Parmesan crisps (with salad)
Cheese sprinkled on soups/salads/etc.
Plain Greek yogurt (with berries/honey/nuts added)
I also walk between 2 and 4 miles 4-7 times a week, weather permitting - same for “senior” yoga.
For what it’s worth: I find having to pay attention to stuff like this confusing, as I need to eat calcium rich foods for osteoporosis, yet also need to watch what I eat to lower my cholesterol level. The two don’t seem to go hand in hand.