First, I am guessing healthier is relative, since you still eat fast food.
Still, the idea of low blood sugars can be addressed. Yes food is turned to glucose, but it is not all digested at the same speed, so a chicken thigh, won't be absorbed as fast as a smoothie.
Sadly, the fast food may be healthier than the smoothie, as far as blood sugar is concerned. It gets absorbed very quickly, and the result is a soaring blood sugar. If you are otherwise healthy, the body releases Insulin in large quantities, since glucose cannot remain in your blood. It has to be used, or stored. So after immediate use, you form glycogen, which is like a waiting room for use in the near future. The rest is turned into triglyceride, and stored. This can be seen in the mirror as body fat.
What is important for you, is that after the body get rid of the glucose, you blood sugar drops, and you get hungry. If you don't eat, you get grumpy. Most likely, you feel hungry two hours after the smoothie, and just use willpower. Willpower may work, but it pisses me off. Probably, you too.
The faster your blood sugar goes up, the larger your release of Insulin, and the faster you blood sugar drops, and you eat again. This happens enough, that we eat extra meals every day, hence Taco Bell's " 4th meal! "
So if you want to avoid being hungry/grumpy, choose foods with a mix of low glycemic carbs, and protein, along with fat. A salad with chicken, and a olive oil/vinegar dressing will keep blood sugars from spiking, and keep you full longer. Or fish, and a side of vegetables, or 2 ozs cheese, and a 1/2 cup raspberries for a snack.
I'm guessing you are short on time, since you eat fast food, so try to mix it up, and get rid of the smoothies. Over time, work on switching more and more away from fast food, and towards healthy solid foods.
The problem was that you listened to everyone saying that smoothies are healthy, and your attempt to eat BETTER, failed because it wasn't true. Both fast food and smoothies are based on one thing.. convenience, and neither are great for you. Still, a Quarter Pounder takes longer to digest than a smoothie.
Before anyone trashes me for the fast food. I will add, that their are other health concerns, and while smoothies may mess up your blood sugars, they would have more nutrients than a Quarter Pounder. This was based solely on blood sugar control. I don't think either are healthy, but my guess is your concern is the hunger/grumpiness first and foremost, so I addressed that. Time is your other problem, and I hope that eventually you get to a point where you have, or make the time to eat healthy meals, which are devoid of fast food, and smoothies, altogether. I figured that would be unrealistic in the near future though, so tried to give you advice that actually helped you.
"We can't solve our problems with the same thinking we used when we created them "
- Albert Einstein
“Whether you think you can, or you think you can't--you're right.”
- Henry Ford
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