Yes, he probably can - with leeway for the fact sometimes some guards may refuse (the probably is 'more yesses than noes', not 'never no'). Higher chances of getting through happen with food leaning towards solid, visible, identifiable.
My parents travel a lot, and often carry homemade food for the same reasons (health, preference, vegetarian). They have traveled with Indian foods - including yogurt rice, which is on the liquid-ish end of the scale and had even that go through. If it's obviously set up as a meal (lunch-bag, plastic cutlery, napkins) that will help a bit, as snacks/food are usually allowed (yeah, not drinks - they're separate), and the more identifiable the stuff in it is, the more likely it will be let pass - for example, a curry or something with visible vegetable chunks in sauce, over rice is more likely to pass through than an opaque, blended liquidy food. The thing about liquids, gels, etc is that most of the security people can't know what they are without testing, so refuse them all, but visible food where they can go, that's carrots, and those're potatoes in a bit of sauce over rice - more likely to get mentally filed under 'food' not 'liquidy-gel-whatsit'. A little bottle of yogurt or buttermilk falls under liquids, and is easier to reject - the same way a salad (already added dressing) goes through, but a little bottle of dressing (for accompanying salad) does not, a pie goes through, but a jar of filling does not.
Take reasonably sized portions, and pack individual portions per person. The bigger containers they see, the more likely they are to question it. Don't hide it, that will make you look shifty. I would suggest transparent containers so it can be identified as food. Have the rice in the same container, it will make the contents seem drier and less liquid-like (it may or may not help to leave it as an unmixed layer, being able to identify the food makes it more likely to go through). You might plan for drier curries or dhals [err, lentils], even if you prefer the moister ones usually, because they're more likely to go through.
Be prepared to let it go if someone does object, and/or explain the dietary restrictions and health reasons if someone does ask. The worst that probably happens is you have to throw it out.