Dakins
There is little I can add to the fine posts and replies you already received above.
Like most things in life, we can control 2/3 of what we experience.
Success in Business or Career ?
It boils down to a great idea, hard work and determination .... luck
You control the first 2, not the 3rd.
Being healthy?
Diet, exercise and ...... genetics
Again we control 2 of the 3.
As for your goals.
Fitness really for the most part (once we stop worrying about genetics) boils down to 3 principle areas ....
1) Diet
2) Resistance Training
3) Cardio
In your case of course, you are looking to lose fat and increase your lean muscle mass and thus your BMR also.
Obviously the lean diet with sufficient protein and complex carbs will be important for the diet part.
Weight training with sufficient intensity to stimulate muscle growth is vital for your goals.
Additionally Cardio is always recommended for heart and lung health .... and yes, also some fat burning benefit.
However, people often over emphasize the idea that you can just "burn away the fat with lots of activity" concept.
You will get tons of varying opinions but assuming you have no medical issues, I tend to suggest people in your situation start with something as follows ...
1. Estimate what your ideal lean bodyweight will be. (example 127 lbs)
Of course keep in mind at some point scales are useless -- only the mirror matters, but you need some reference point to start with.
2. Using this example, structure a diet of 4-6 meals per day that put your total protein intake between 90-127 grams
Meaning about 20 grams of protein each meal
3) Get about 20-35 grams of fat per day
4) Start with your carbs at about 1.5X your desired bodyweight ... thus in this example around 200 grams or so.
Note- this is only a rough estimated starting point.
While the protein and far number above are pretty fixed, you will have the most variety in this section depending on what you really need
The guidelines from others above for food selections are good guides
Figure on weight resistance training where you are working each body part 1 to 1.5 times per week with 3 different exercises for each body part, 3 working sets of 8-15 reps each.
Cardio .... 30-45 min .... 3 times per week ........working inside your THR range
Now... what is reasonable to expect in 4 months
Here is a personal example of a 16 week transformation following guidelines such as I briefly summarized above .
Your goals will of course be different, but this should serve as a brief summary of one method by which to start on your goals.
I am sure others will offer other suggestions that may be as valid.
What is most important is what really works for you best.
Good Luck
Michael Spitzer