My brain hurts. There is some relevance to what you're talking about concerning insulin, carbohydrates (specifically fructose), inflammation, and high blood pressure due to atherosclerosis, but you're getting pretty far afield of the question as well as making some assumptions about the OP that are totally unfounded. For starters, how would you know the OP isn't 120 pounds and 5'8", and doesn't have 10 pounds to lose? Weight loss is a statistically supportable treatment for HBP if the individual is significantly overweight, but in the absence of excess weight, it's useless.
Sodium and caffeine have both proven to increase blood pressure in multiple studies dating back decades, so I have no idea what you're on about saying it isn't confirmed. Go to a McDonalds. Order a Big Mac meal with a Coca-Cola. Sit down, wait two minutes, take your blood pressure five times, and average the readings. Eat your Big Mac, fries, and drink your 32oz Coke. Don't get up. 45 minutes after you started eating, take your BP again five times, and average the readings. I will guarantee you have higher blood pressure after your sodium and caffeine-laden meal. Your resting heart rate will be jacked, too.