Many people think that eating more protein, including protein bars, is an effective way to lose weight and keep it off. But just eating more protein will not fill you up. Not unless you also cut carbohydrates and drop vegetable oils and artificial flavoring. Without that, it will likely raise your weight. It will likely raise your metainflammation too (the body-wide inflammation driven by metabolism).
Food makers are experts at building food that tastes good and drives you to eat more, so they can sell more product. Think of how good protein bars, protein shakes, protein cookies and protein chips taste. They are engineered to be hyperpalatable (tasty). Taste overrides feeling full every time.
On top of that, food makers use artificial and real sugar (subsidized fructose), white flour (subsidized), processed and hydrogenated oils (subsidized), synthetic food additives (engineered) and vitamins, heat treatment, and the extrusion of grains. Extrusion makes a product high in carbohydrates, but poor in nutrition. In extrusion, grains are hit with high heat and pressure. That destroys many of the plant nutrients left in them. It also breaks down the fatty acids and makes them oxidize (go rancid). Some of the proteins break down at random and form neurotoxins (nerve poisons). It is much like how trans-fat can be made from omega-6 PUFA in high heat.
There is a dark side to protein. Do not trust the label on a processed food to tell you how much protein it really has.
Food label numbers are an estimate. They add up the calories from the nutrients that carry energy: protein, carbohydrate, fat, and alcohol. The Atwater system uses average values: 4 Kcal/g for protein, 4 Kcal/g for carbohydrate, 9 Kcal/g for fat, and 7 Kcal/g for alcohol.
The food labels measure nitrogen, which is assumed to come from protein. “The protein content of foods has been determined on the basis of total nitrogen content… nitrogen content is then multiplied by a factor to arrive at protein content,” says the Food and Agriculture Organization of the United Nations.
http://www.fao.org/3/Y5022E/y5022e03.htm
But we have seen crooked cases where makers simply raised the nitrogen in food. Sometimes they added toxins such as formica or melamine.
Scientific American reports that “dairy products… contaminated with a chemical called melamine have sickened at least 54,000 babies and killed four… melamine is a nitrogen-based compound used in commercial and industrial plastics… An estimated 8,500 dogs and cats died of kidney failure after chowing down on melamine laced fare… food companies use the nitrogen-based compound in wheat flour and other products to make these products appear to have more protein. Normally, proteins are the only source of nitrogen in food, so by looking for that element in tests, one can figure out relative protein concentrations.”
https://blogs.scientificamerican.com/news-blog/why-is-melamine-in-baby-formula-you-2008-09-24/
The amount of nitrogen, which stands for protein, does not mean it is bioavailable (usable by the body). It does not even mean it is protein.
A surplus of calories, whether fat, protein or carbohydrate, will all lead to weight gain. What matters is the quality of the calorie. It is also how the body responds to those nutrients as signals, beyond their calories. The body’s ability to turn food into usable energy is a very complex process. It starts with chewing and churning the food. Then come chemical and enzyme steps all through the gut. The whole process is significantly affected by each person’s microbiome (gut bacteria). The body is not static. How it uses a nutrient, and how much of the energy associated with it gets pulled out, changes all the time. The real issue in managing obesity and type 2 diabetes is how the body uses the nutrients it gets. Does that approach work for that person, at that time? In the end, we have had many patients who drank protein shakes, thinking they would get skinny. But eating more of a hyperpalatable (overly tasty) processed food only drives metainflammation.
If you eat whole real food, none of this matters. Get natural protein from natural sources. Avoid processed foods, vegetable oils, and refined carbohydrates and grains.
Frequently asked questions
Does eating more protein help you lose weight?
Not on its own. Adding protein without cutting carbohydrates, vegetable oils and artificial flavoring will not fill you up. It will likely add weight and metainflammation. A surplus of calories leads to weight gain whether it comes from fat, protein or carbohydrate. What matters is the quality of the food and how your body responds to it.
Are protein bars and protein shakes good for weight loss?
No. Protein bars, shakes, cookies and chips are engineered to be hyperpalatable. And taste overrides feeling full every time. Many are made from subsidized sugar, white flour, processed oils and extruded grains. We have had many patients who drank protein shakes thinking they would get skinny. But eating more of a food like that only drives metainflammation.
What’s the healthiest protein for weight loss?
Natural protein from natural sources, eaten as whole, real food. If you eat whole real food, the questions about labels and processing stop mattering. The protein number on a processed food label is estimated from nitrogen. That does not prove the protein is bioavailable, or that it is protein at all. Avoid processed foods, vegetable oils, refined carbohydrates and grains.
Related reading
Sources
- Hall KD, Ayuketah A, Brychta R, et al. Ultra-processed diets cause excess calorie intake and weight gain: an inpatient randomized controlled trial of ad libitum food intake. Cell Metabolism. 2019. PMID 31105044
- Ludwig DS, Ebbeling CB. The carbohydrate-insulin model of obesity: beyond “calories in, calories out.” JAMA Internal Medicine. 2018. PMID 29971406
Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP
Interventional pain physician, addiction medicine specialist and obesity medicine diplomate.
Licensed in Missouri and Illinois.
Last reviewed June 17, 2026
