Why weight loss and health is a journey and not a project
The diet/health journey is personal quest through the fog of misinformation and ignorance (lack of information), all the while battling the waxing and waning of motivation and the slow painful slog through self-discovery.
There are several obstacles to overcome, none of which solved, in isolation, will likely eliminate your health weight/health issues.
Obstacle #1: Discovering what real food is and how to find it and prepare it. (Paleo, Weston A. Price, etc.)
Obstacle #2: Staying motivated after the "honeymoon" phase is over and moving from a project to a lifestyle. We either stall, regain, run into health problems, etc.
Obstacle #3: Discovering how your individual body works. Do you have a carb/insulin problem, do you have a sleep/hormonal problem, do you have a long-term nutritional deficiency/digestive issue, does your body have a preference for or against fat? Etc, etc, etc....
"It isn't the mountain ahead that wears you out - it's the grain of sand in your shoe."-Robert Service, writer (1874-1958)