Answer: Talk to your doctor or talk to a professional dietitian.
BUT I recommend you talk to your doctor because they'll know your situation and they can help you out better. Not only can they give you suggestions but they'll know the situation your in.
Find alternatives that go around the limitations whether it's budget limitations, food preferences, religious reasons, or allergies. Go out of your comfort zone to try different healthy foods, or mix an ingredient you do like with the healthy food to make it more appealing.
60 - 70% of maximum heart rate: This zone provides the same benefits as the healthy heart zone, but is more intense and burns more total calories. The percent of fat calories is remains up to 85% in this zone.