Not only artificial sugar, and even sugar substitutes may induce insulin response. Artificial sugar damage your gut microbiome, which acts as blood sugar buffer and responsible for your overall health.
Dairy from conventional have more estrogen in them (grain & soy) as well as hormones which can impact your IGF level and be contributing to weight gain. Milk is a bad idea for weight loss imo, as it have sugar and blood sugar effects, as well as IGF. However, good full fat dairy from 100% grassfed have conjugated linoleic acid which help with weight loss.
There are other things like thyroid health and household toxins like hygiene and laundry products that’s inhibiting your ability to lose weight. My personal belief is detoxing is an important aspect of weight loss. For several years now I only use Dr. Bronner’s organic soap and non-toxic laundry products.
Maybe I haven’t come across this, but I’d like to see a study of fat loss effectiveness of a diet higher in monounsaturated fat vs saturated, and vice versa. I wonder if shifting a bit toward monounsaturated help as it is a good fat for energy burning (see links: 1, 2 , 3). Also protein might even be a more satiating macro than fat, doesn’t mean you should over do it, but something to consider. Tidbit on body composition and macronutrient ratio, reducing fat intake may help: http://www.youtube.com/watch?v=Jd8QFD5Ht18&t=26m5s