I'm currently starting a weight loss program after a fairly sudden gain of 60 pounds (on medication). But I have been reading a lot for many years about nutrition, first inspired by a nutritional anthropology class in university (still have the texts for reference). I have lost weight in the past successfully (20 pounds longer term) and I have tried popular diets which only worked short-term (varied results). I feel that a lot of the weight I am now carrying is my body rebelling against limited food intake and the meds I am on.
You have a lot of great points above, but I wanted to add a few more:
- I have read in several sources that fruits are important to a healthy diet, but they are best digested on their own rather than combined with other foods. Some sources say wait an hour before or after eating fruit to eat something else, since it affects how the fruit is digested (it could be fermented if other foods are present in the gut). I wouldn't worry so much about the sugar /fructose in fruit, unless you are eating more than 4 or 5 portions a day. Fruit provides fibre and many micronutrients (vitamins, minerals, antioxidants, phytochemicals, etc.)
- Protein is important for weight loss and helps control hunger, but excess protein can cause Ketosis, which in itself is not bad (good for weight loss), but can be if ammonia concentrations in the body are exceeded far above normal limits. Then the ammonia concentrations (from the nitrate group formed by the amino acids) wreak havoc on the body tissues. Excess protein can be stored as fat as well. In summary: short term weight loss that can lead to illness and eventual weight gain again.
- you probably already know: COHs (carbs) and proteins are 4 kcal per gram, fat is 9 kcal per gram, so I differ with Kyle that "protein is calorie dense" (fats are). You need all 3 essential macronutrients: carbs, proteins and fats in a healthy diet, and limiting any of these groups for supposed weight loss will only lead to illness and likely rebound weight gain as the diet is not sustainable. Also, each of these macronutrients are needed in the body for bodily functions, and lacking these can cause impaired function of the body systems and this can lead to weight gain (has for me).
- If you are happy with 1200kcal per day, that is fine, but I have read that caloric intake should be a bit higher for optimum health. The low calorie intake may be too low for long-term weight maintenance. I've read (depending on the individual's size) that most women should not go below 1500 kcal per day. I have 2 examples: myself, I actually am experiencing rebound weight gain from being on too strict an eating plan that was lower in calories, compounded by the meds. I have a friend who is a avid runner that is gaining weight on 1200kcal a day. The limited nutrition she experienced has caused her adrenals to stop functioning properly and that has messed up her whole hormone system, causing the weight gain that she is having great difficulty losing now.
- Nutritionists are only as good as their education -- and I could go really OT here but I won't -- and I have met with a nutritionist during a hospital stay. I followed her advice and 2 months later I was 40 pounds heavier! It wasn't necessarily her fault, but I have since learned that her program (what is commonly taught in medicine and the Canada Food Guide) is not necessarily what is best. I believe that this information will be commonly considered outdated within a few years as continued research shows that some guidelines need to be changed. Not trying to be too negative, but I have learned that with medical practitioners as much as anything: "buyer beware".
Sorry, this is sounding like a rant. I want to congratulate you and encourage you on your efforts. Figuring out the right plan is challenging and takes some time and info. I just wanted to hopefully answer a couple of your questions and give some of the facts I have repeatedly read. I personally find my current weight /health situation a little frustrating and wouldn't want someone else to go through it as well, especially if they can learn from my mistakes.