Elderly dementia male excessive sleeping, no breakfast or lunch, losing weight. Drank 32 oz milkshake, 1/2 sandwich, little soup, water. Enuf food?

Poor nutrition in. the diet you mention, not the amount that is the real issue. Please see a nutritionist who can help you create a good food plan. Every meal needs to contain protein, fats, and carbs. Lots of good fats helpful to the brain. These are things like olive oil, coconut oil. Check w/doc first. Peace and good health.