If someone is carrying to much body fat, then optimizing metabolism is the most important. Cardio is great for the heart, for building stamina, endurance, releasing endorphins, relieving stress etc...I should have put more context in most post, I meant in the context of starting out. If someone is going on a weight loss journey, well it should be fat loss, then starting out you have to eat a better diet and weight train. You can introduce some cardio later. In the begining, I think walking is fine, just not to much. I'm not big into calorie cutting, the type of foods you eat matter more. Eating whole foods is the most important, you will naturally eat less because whole foods tend to have more satiety. But most importantly, whole foods have a positive metabolic impact in our system. The hormonal profile changes for the better, nutrients are used better, your body doesn't have to utilize resources to deal with food chemicals, and all the crap and toxins in the process foods. The result is an optimized metabolism. The problem is calorie cutting combined with cardio is you condition your metabolism to slow down. Again, if your goal is weight loss, then have it, but you won't have an optimized metabolism and as healthy of a body comp. Long term that is not good. That is one of the reason why people gain the fat back. Resistance training is great for the metabolism and hormonal profile long term, especially for the blood sugar metabolism.
You're using a lot of words (optimizing metabolism, toxins, starvation state, etc) that are making my Spidey senses tingle. Can you please provide anything to back up some of these claims?calorie cutting combined with a lot of cardio also puts your body in a starvation state. You will lose weight, the problem is some of that is muscle. What this means is your body changes it's hormonal coctail. Your testosterone will go down, you will stop producing leptin (this is a fat burning hormone), and your cortisol will go up. Cortisol is stress hormone, some of it is good, but to much and it is very much a catabolic hormone. Higher cortisol due to dieting and cardio eats muscle tissue. The result is a lower metabolism, which makes it hard to maintain a healthy body comp, especially long term. Of course if you are okay with skinny fat, then no issue. As always, genetics play a role and not everyone is the same. Some people can get away with more cardio and dieting than others without the negative effects.
People should eat a mostly healthy but maintainable diet and consistently do strength training and some cardio (zone 2 being the best for long term health). Maintainable and consistency being key words. It is a lifetime journey not a 1 month diet. I'm no expert but I listen to a lot of people that are way smarter than this stuff on me. At the end of the day the health and fitness industry tries to overcomplicate things and for 98% of us we just need to get really good at the basics that I posted in the first sentence of this paragraph.