After age 40 your body will fight your efforts to burn fat because of changes in hormones and metabolism. The usual methods you have used are no longer working.
SOLUTION:
You need a different approach that uses your body fat for fuel, which will override the age related metabolic and hormonal changes. Average loss with this approach is 20 lbs in the 6 week Losing Phase.
Many busy professionals after age 40 have many demands in their lifestyle making it difficult to stick with a food or exercise plan resulting in slow or unsustainable progress. For many as well food becomes a coping mechanism to deal with the stress of their high performance life.
SOLUTION:
You need a strategy that is simple and structured, that will fit into your demanding lifestyle so you can be consistent. To improve consistency you also need coaching and tools to address any mindset issues so you become the master of your food choices and are no longer at the mercy of your cravings due to stress.
Being able to keep weight off easily without feeling you need to be on a lifelong diet or living at the gym is the holy grail of weight loss. Using methods for weight loss that result in muscle loss and impact metabolism will make it very difficult to maintain the weight loss results, keeping you stuck in this struggle which will only get worse with age as you lose more muscle.
SOLUTION:
You need an approach that incorporates strategies to increase muscle mass at the appropriate time after burning fat so your metabolism is working for you making weight maintenance very easy. This will set you up to have more flexibility in your lifestyle choices. Increasing muscle mass is the path to optimizing lifespan and biggest predictor of healthy aging for a person who wants to be a high performer throughout their long life.