Typical chocolate is generally full of pesticides, herbicides, and other biocides. A bunch of cocoa also involves slave labor(2). Finally, this article is about the cocoa part of chocolate and, as discussed, doesn't mean that other ingredients are automatically conducive to health and support its properties while improving flavor - quality chocolates have relatively low sugar. Let's proceed.
[My parents and I have personally looked at a number of muffin labels and found that the whole things were multiple servings of well over that 150 calories each - and were flour, sugar, and other counterproductive things! Even somewhat lower-calorie foods, though, can be chemical-laden and empty.] Cocoa, though, has a number good compounds that are worth consuming it for. These have stress-reducing, gut-healthy, cancer-inhibiting, and even skin-healthy properties just to name a few(2).
Flavonoids also found in tea have been shown to boost cognitive performance. Chocolate has been associated with an average 33% less insulin resistance in diabetics and higher HDL, commonly called the "good" cholesterol. It has been linked to reduced neuron cell death associated with Alzheimer's, improved skin condition, and reduced skin redness. It acts "as a mild vasodilator through enhancing nitric oxide concentrations in the lining of the blood vessels" - in a manner safer than chemical statins which will actually cause heart problems in the overall picture. Plus, it's a food [plainly a number of nutrients] versus just a single-minded chemical(2).
References:
1. Ji, Sayer. "Chocolate Gives Statins a $29 Billion Run For Their Money." GreenMedInfo. GreenMedInfo.com. 16 April 2012. Web. April 19, 2024. https://www.greenmedinfo.com/blog/chocolate-gives-statins-29-billion-run-their-money.
2.https://draxe.com/nutrition/benefits-of-dark-chocolate/