Foods are classified as acid-forming or alkalizing depending on the effect they have on the body. Acid-forming diets lead to acid indigestion that eventually creates a condition known as chronic acidosis which acidifies body tissue. This acidification process chokes off oxygen within cells and eventually compromises the immune system.
The statute of limitations is a rule that sets a time limit within which a creditor may sue you for payment of a debt. The length of time that a creditor has to sue you on an unpaid debt varies from state to state. In some states, it's four years. In other states, it might be longer.
It sounds like you have two questions here. The first one is whether the collector can still try to collect a medical bill that is more than ten years old. That is a matter of state law, and depends on the statute of limitations for that debt. According to my sources, the statute of limitations for most types of debts in Indiana is six years. If the statute of limitations on this debt have indeed expired, then there would not be much the collector could do to force you to pay this debt.