I have to admit up front, that I haven't actually tried this to test out if it works. I have a problem with testing the theory because I'm lactose-intolerant, and I don't know what a tulsi leaf is or where to get one.
The apple - yes I have an apple or other fresh fruit every day. Hasn't kept my doctors away yet. Maybe I need to eat more to make them allergic to me.
I explained about the lack of tulsi leaf. Guess I'll have to live with cancer - fortunately the only cancers I've had have been a spitz tumour when I was a baby and a basal cell carcinoma a couple of years ago. (Both were skin cancers surgically removed without major trauma.)
A lemon a day - I don't have one but it wouldn't bother me if I did. I regularly use lemon juice as a salad dressing. Would it magically dissolve fat? No. It would help lower the glycaemic index of any carbohydrate I ate it with, because acids have the effect of lowering the GI of carbs they're eaten with.
A cup of milk a day. Well, as I said I don't have regular milk. I do however have lactose-free milk, calcium-enriched soy milk, cheese and yoghurt. I have the equivalent to at least a cup, probably two, of milk each day. According to my blood tests, I still need to take calcium and vitamin D supplements to protect my bones. A single cup of milk a day isn't enough.
Three litres of water a day - no diseases. I can't try that at the moment. I'm having this problem with fluid retention, and having to take extra fluid tablets and reduce my fluid intake to stop my feet swelling like balloons and having a horrendous headache! When I did sport, I would have easily drunk three litres of water a day. I still got sick. I got very sick. (I've read that the point of over-hydration for a healthy adult is about 7.5 litres (2 gallons) of water per day. So for most people, three litres is probably quite safe even if it's more than necessary. Yes, it is possible to die from drinking too much water - as with consuming too much of anything.)
It would be great if it were possible to have easy answers. I wish curing lupus, or preventing other diseases, were as simple as adding a few fresh foods to our diets. Since I eat mostly fresh foods, this would be ideal for me.
P.S. Ask and you shall receive. As I write someone on G+ has answered my question about tulsi leaf. It's a form of basil. I'm good with that - I grow my own basil and eat it frequently. I'd love to grow another kind and would happily eat it every day. (Even if it doesn't prevent cancer, basil is delicious!)