Your changes in
LDL and
HbA1c within one month do not necessarily mean that your diet has failed. LDL 93 → 112 mg/dL is a relatively modest change and can occur due to normal biological/laboratory variation, recent dietary patterns, weight changes,
thyroid status, stress, sleep, physical activity and other metabolic factors. Avoiding fried and processed foods is definitely a good step, but cholesterol is influenced by more than these foods alone.
Regarding HbA1c, 5.3% - 5.7%, However, HbA1c reflects your average blood glucose over roughly the previous 2–3 months, so a change seen after only one month should not be interpreted as being caused entirely by what you ate during that month.
Since you have had a sedentary lifestyle for several years, gradually introducing physical activity would be beneficial. You don't need to suddenly start intense exercise. Begin with 10–15 minutes of comfortable walking daily, preferably after meals, and gradually increase toward around 150 minutes/week of moderate activity as tolerated.
Since your ECG, echocardiogram and TMT are normal, that is reassuring. However, if you experience chest pain/pressure, unusual breathlessness, fainting, severe dizziness or palpitations during exercise, stop exercising and seek medical evaluation promptly.
From a nutrition perspective, I would suggest focusing on a balanced diet rather than excessively restricting food: adequate protein, vegetables and fibre, whole grains/millets in appropriate portions, nuts/seeds, fruits in controlled portions, and limiting added
sugar, refined carbohydrates, trans fats and highly processed foods. Also pay attention to sleep, stress, hydration and regular activity.
Now, Repeat your Blood test after 3 Months.
Most importantly, don't become afraid of exercise because of the possibility of a heart attack. Start gradually and consistently rather than intensely. Your current results need monitoring, but they do not by themselves indicate that you should avoid physical activity.